This is part of a series on nonviolent protest methods, which explains approaches and provides inspirational examples from history. For additional resources, please explore the Museum of Protest’s activist guides and view items in the collection.

When Argentina’s military dictatorship banned public gatherings in 1977, fourteen mothers seeking their “disappeared” children discovered a profound tactical truth: police could order them to stop standing, but they couldn’t outlaw walking. By continuously circling the Plaza de Mayo, these women transformed an afternoon stroll into one of history’s most enduring acts of resistance.

The mill-in—where protesters walk continuously in patterns rather than standing still—represents Method #166 in Gene Sharp’s taxonomy of 198 nonviolent action methods, a form of physical intervention that exploits the legal and psychological gaps between movement and occupation. This guide explores how this deceptively simple tactic works, why it remains strategically powerful, and how movements worldwide have adapted walking in circles to challenge some of the most repressive regimes on earth.

How walking became a weapon against repression

The mill-in emerged from practical necessity rather than theoretical planning. During Argentina’s “Dirty War” (1976-1983), security forces made between 9,000 and 30,000 people “disappear”—kidnapped, tortured, and killed without trial. When grieving mothers first gathered in the Plaza de Mayo on April 30, 1977, police immediately confronted them with the dictatorship’s ban on public gatherings of more than two people. A simple instruction changed everything: “Link arms in pairs and walk.” By moving counterclockwise around the plaza’s central pyramid monument, these women technically complied with the law while still creating a visible, collective presence.

This innovation spread globally because it solved a universal problem faced by dissidents under authoritarian rule. In Istanbul, families of Kurds who vanished during the 1980s and 1990s launched the Saturday Mothers movement in 1995, directly inspired by the Argentine template. In Leipzig, East Germans began weekly walks after Monday prayer services in 1989, eventually swelling to crowds of 500,000 that precipitated the Berlin Wall’s fall. Each case demonstrates how continuous movement creates tactical advantages that standing or sitting cannot achieve.

The formal classification of mill-ins came through Gene Sharp’s 1973 work The Politics of Nonviolent Action, based on his Oxford doctoral research. Sharp documented the method under “Physical Intervention,” grouping it with related tactics like sit-ins (#162), stand-ins (#163), and pray-ins (#167). Academic reviewer Brian Martin noted that while these methods might appear similar, Sharp “was acknowledging methods actually used”—meaning mill-ins had been deployed often enough in real movements to warrant their own category.

What makes a mill-in different from other protest forms

Understanding mill-ins requires distinguishing them from superficially similar tactics. The differences matter enormously for legal protection, physical sustainability, and strategic effectiveness.

Marches move from one location to another—they have a starting point, a route, and a destination. Marchers seek to demonstrate numbers, often requiring permits for street usage. Mill-ins stay in one general area but maintain constant motion within that space. There is no destination; the walking itself is the action.

Picketing typically involves linear movement outside a location, usually a business or workplace. Picketers walk back and forth or in an oval, carrying signs to inform passersby about a grievance. Picket lines have deep roots in labor organizing and strong legal protections in most democracies. Mill-ins differ by often occurring inside spaces or in areas where traditional picketing would be impossible or prohibited.

Sit-ins and stand-ins involve stationary occupation. Protesters take positions and refuse to move, accepting the possibility of arrest for trespassing, disorderly conduct, or other charges. These methods escalate confrontation and require participants willing to face consequences. Mill-ins deliberately avoid this escalation by maintaining movement—technically, protesters aren’t “occupying” anything because they never stop moving.

Vigils are stationary gatherings, often silent, that serve as moral witness. Vigils typically use candles, signs with photos, or religious symbols. While powerful for memorialization, their static nature makes them vulnerable to dispersal orders. Mill-ins combine the sustained presence of vigils with the legal protection of continuous movement.

The strategic choice between these methods depends on context. Mill-ins work best when avoiding arrest is crucial, when actions must be sustained over long periods, when operating in spaces where other tactics would trigger immediate removal, or when legal ambiguity benefits the movement.

The Madres de Plaza de Mayo: forty-seven years of walking

No example better illustrates the mill-in’s power than Argentina’s Madres de Plaza de Mayo, who have circled the same plaza every Thursday at 3:30 PM for nearly half a century. Their persistence offers a masterclass in how continuous walking achieves what static protest cannot.

The movement began with fourteen women in April 1977. They wore white headscarves—initially actual diapers that symbolized their missing children—and carried photographs of the disappeared. When security forces ordered them to disperse, they simply kept walking. The circular pattern around the Pirámide de Mayo monument became their signature, with women moving counterclockwise in pairs or small clusters.

The regime’s response was brutal. In December 1977, three founding members—Azucena Villaflor, Mary Ponce de Bianco, and Esther Ballestrino de Careaga—were kidnapped and murdered. Their bodies were later discovered in mass graves. Security forces used attack dogs, tear gas, and mass arrests against the marchers. Yet the walking continued.

By maintaining their pattern through the worst repression, the Madres created something the dictatorship couldn’t destroy without international backlash. Foreign journalists covering Argentina found the weekly walk an irresistible visual: elderly women in white scarves slowly circling a plaza, holding photos of young faces. The simplicity made the brutality unmistakable.

After Argentina’s return to democracy in 1983, the Madres continued walking, now pressing for accountability rather than information. Their persistence contributed to prosecutions of military officials—hundreds have been convicted of crimes against humanity. In 1992, the European Parliament awarded them the Sakharov Prize for Human Rights. By 2023, they had completed over 2,392 marches, making this the longest-running continuous protest action in modern history.

The Madres demonstrated several enduring principles: circular walking creates a self-perpetuating ritual that becomes harder to stop with each passing week; the visual image of walking mothers is difficult for authorities to delegitimize; and persistence measured in decades can outlast regimes.

Monday demonstrations that brought down the Berlin Wall

Leipzig’s Monday Demonstrations of 1989 show how mill-in tactics can scale from modest prayer meetings to revolutionary movements capable of toppling governments. The transformation happened within weeks, demonstrating the explosive potential contained in steady, rhythmic walking.

The seeds were planted years earlier at the Nikolaikirche (Church of St. Nicholas), where peace prayer meetings had convened every Monday since 1982. The church provided institutional protection that secular gatherings lacked in the German Democratic Republic. By autumn 1989, with the GDR’s rigid communist system showing cracks, these prayer sessions began attracting larger crowds seeking change.

On September 4, 1989, approximately one hundred people walked from the church onto Leipzig’s ring road after prayers. The following weeks saw steady growth. By October 2, around 20,000 marched. Then came October 9—the decisive moment when history could have gone either way.

The GDR deployed 8,000 police, soldiers, and Stasi agents in Leipzig that night. Hospitals reportedly stockpiled extra blood supplies, fearing a “Chinese solution” referencing the Tiananmen Square massacre four months earlier. Party hardliners had signaled their willingness to use maximum force. Yet 70,000 people showed up to walk.

The marchers carried candles, making armed assault a visual and moral impossibility. The sheer numbers overwhelmed any containment strategy. Crucially, the walking format allowed participants to leave if violence erupted—unlike a sit-in, they weren’t committed to arrest. This lower threshold for participation brought out people who wouldn’t have risked static occupation.

Security forces never fired. Within one week, 120,000 people walked in Leipzig. On November 9, the Berlin Wall fell. By November 11, an estimated 500,000 marched through Leipzig alone, with similar numbers gathering at Berlin’s Alexanderplatz.

The Leipzig experience revealed how mill-ins can function as escalation ladders. Low-risk walking attracted moderate participants first. As numbers grew, risk decreased further, bringing more cautious citizens. The cycle accelerated until the movement became unstoppable. The chant that echoed through these marches—”Wir sind das Volk” (We are the people)—became possible only because enough people felt safe enough to walk.

Saturday Mothers and the long vigil in Istanbul

Turkey’s Saturday Mothers demonstrate both the adaptability and the vulnerability of mill-in tactics when facing determined authoritarian pushback over decades. Since May 27, 1995, relatives of people who “disappeared” in custody have gathered at Galatasaray Square on Istanbul’s Istiklal Avenue, holding photographs and demanding answers.

Explicitly modeled on the Madres, the Saturday Mothers format combined elements of vigils (sitting with photos) and mill-ins (gathering repeatedly in a specific public location in defiance of restrictions). Their gatherings typically lasted thirty minutes, with participants sharing stories of individual disappeared persons.

For twenty-three years, authorities largely tolerated the weekly gatherings. Then, on August 25, 2018—their 700th vigil—everything changed. The Interior Ministry declared the protests illegal. Riot police attacked the gathering with plastic bullets and tear gas. Forty-seven people were detained, including women in their seventies and eighties.

The crackdown revealed both the power and limitations of walking protests. Power: after nearly a quarter century, authorities still felt threatened enough by elderly women sitting with photographs to deploy riot police. Limitations: unlike the Madres who had international protection from Argentina’s transition to democracy, Turkey’s Saturday Mothers faced a government increasingly comfortable with repression.

Despite ongoing trials against forty-six participants for “illegal assembly,” the movement persists. In late 2023, authorities permitted limited gatherings of ten-person delegations. By May 2024, the Saturday Mothers had held over 1,000 weekly vigils, demonstrating how even partial restrictions cannot entirely extinguish a determined walking movement.

Be like water: Hong Kong’s mobile resistance

The 2019-2020 Hong Kong protests revolutionized mill-in tactics for the digital age, transforming continuous movement from a circle into a fluid, citywide strategy that authorities struggled to contain. While not traditional circular walking, the Hong Kong approach represents the logical evolution of mill-in principles.

The movement explicitly rejected the occupation tactics that had failed during 2014’s Umbrella Movement, when protesters held stationary positions for 79 days before police cleared them. Instead, organizers embraced martial artist Bruce Lee’s philosophy: “Be formless, shapeless, like water.” Protesters would “gather like dew, scatter like mist,” appearing suddenly, demonstrating, then dissolving before police could contain them.

Technology enabled coordination at unprecedented speed. Encrypted Telegram groups—some containing over 50,000 members—allowed real-time tactical adjustments. The LIHKG forum functioned like Reddit for movement strategy. Apps like Bridgefly enabled Bluetooth communication when authorities cut cellular signals. Crowd-sourced maps tracked police positions, allowing marchers to flow around blockades.

The August 23, 2019 “Hong Kong Way” demonstrated how walking protests could scale to city-wide dimensions. On the thirtieth anniversary of the Baltic Way (when two million people linked hands across Estonia, Latvia, and Lithuania), Hong Kong protesters created a 50-kilometer human chain along three major transit lines. An estimated 210,000 people participated, coordinated almost entirely through online platforms.

Distinctive innovations included sophisticated hand signals passed along walking lines—specific gestures requested helmets, water, scissors, or umbrellas, which were then passed forward through human chains. Protesters at traffic lights reformed walking routes to avoid blocking vehicular traffic, reducing legal vulnerability while maintaining presence.

The “be like water” approach frustrated traditional crowd control. Kettling—encircling protesters to prevent escape—failed when targets scattered through subway stations, reformed elsewhere, then disappeared again. Without fixed positions to defend, demonstrators were harder to arrest. The mobility came at a cost, however: the movement’s refusal to hold territory made it difficult to force immediate concessions.

Women in white and the Belarus uprising

Belarus’s 2020 protests introduced another mill-in variation: the solidarity chain. Three days after the disputed August 9 election that kept Alexander Lukashenko in power, approximately 250 women wearing white clothing formed human chains near Minsk’s Komarovka market. They held flowers, not political signs. They walked, not marched. The simplicity was strategic.

White clothing symbolized peaceful intentions, making police violence appear disproportionate. Flowers evoked romance rather than confrontation. The chains connected individual women into a visible collective, stretching at times for nearly two miles. Some groups sang “Kalyhanka,” a traditional Belarusian lullaby, as they walked—an act of cultural reclamation that carried political meaning without explicit sloganeering.

One seventy-three-year-old woman, Nina Bahinskaya, became an icon when police stopped her and she replied simply: “I am just out for a walk.” This captured the mill-in’s legal gray zone—how do you arrest someone for walking?

Telegram channels proved essential for organizing, with encrypted communications allowing rapid mobilization while evading surveillance. The protests expanded quickly, with hundreds of thousands eventually participating across the country. One women’s march in September 2020 resulted in nearly 400 arrests, showing the limits of peaceful walking when authorities decide to use force regardless of optics.

The Belarus experience illustrated how women-led walking protests carry particular moral authority. Like the Madres, like the Saturday Mothers, like Women in White, the visual of elderly and middle-aged women being dragged away by riot police created powerful imagery that regimes struggle to justify. Movement leaders Maria Kolesnikova (arrested), Svetlana Tikhanovskaya (exiled), and Veronika Tsepkalo (exiled) became international figures precisely because their persecution appeared so disproportionate to walking in white dresses.

How continuous movement creates legal gray zones

Mill-ins derive much of their strategic value from exploiting legal ambiguities around loitering, obstruction, and assembly. Understanding these distinctions helps organizers navigate risk.

Loitering laws typically criminalize remaining in one place without apparent purpose. The U.S. Supreme Court struck down many such statutes as unconstitutionally vague in Papachristou v. City of Jacksonville (1972), holding that making it criminal to “wander without apparent purpose” gave police too much discretion. Continuous walking demonstrates purposeful movement, falling outside most loitering definitions. As legal guidance notes, “merely standing or walking in a public space, without more, is not typically enough to establish loitering.”

Obstruction charges require proving that protesters blocked passage. According to ACLU guidance, marching on sidewalks without obstructing traffic requires no permit. Mill-in organizers can minimize obstruction claims by leaving at least half the sidewalk clear, moving when asked to allow passage, and not blocking building entrances. Continuous movement makes obstruction harder to prove than static occupation.

Assembly permits generally aren’t required for walking on public sidewalks. ACLU materials across multiple states confirm that permits are typically needed only for blocking streets, using sound amplification, or organizing large events in designated parks. Spontaneous protests responding to breaking news cannot be restricted by advance-notice permit requirements under First Amendment doctrine.

Indoor versus outdoor spaces present the starkest legal distinction. Streets, sidewalks, and parks are “traditional public forums” with the strongest First Amendment protections. Government can impose only reasonable time, place, and manner restrictions. Private property—including shopping malls—receives minimal First Amendment protection under federal law. Property owners can order protesters to leave and enforce through trespass charges. Indoor mill-ins thus operate on borrowed time, remaining lawful only until security issues a clear warning to leave.

The key tactical insight is that continuous walking delays confrontation. In outdoor public spaces, authorities need stronger justification to disperse moving protesters than stationary ones. In indoor private spaces, walking initially appears as normal customer behavior, buying time before trespass warnings. Either way, movement creates hesitation that organizers can exploit.

Organizing logistics for sustained walking

Successful mill-ins require careful planning around coordination, rotation, communication, and physical sustainability. These practical details often determine whether a walking protest lasts hours or decades.

Patterns and formations should be established in advance. Common configurations include:

• Circular patterns around a central point (the Madres model)
• Figure-eight or infinity loops that create visual impact
• Serpentine routes through larger spaces, harder to encircle
• Orbital patterns around target buildings

Shift systems enable long-duration actions. The Leipzig Monday demonstrations ran for hours partly because participants rotated—some walked while others rested nearby. Organizers can divide participants into waves with set time slots (two to three hours works well), maintain staging areas for resting participants, and use encrypted messaging apps to coordinate handoffs.

Communication during action should minimize identifying leaders. Hand signals work better than verbal commands—they’re quieter and don’t single out organizers for targeted arrest. Hong Kong protesters developed sophisticated systems where gestures requesting specific supplies passed through human chains. Pre-agreed signals for regrouping, dispersing, or changing direction reduce dependence on central coordination.

Physical accessibility deserves attention. Walking is more sustainable than standing for most people, but participants with mobility limitations need accommodation. Some movements integrated wheelchairs into walking patterns or created slower-moving lanes. Comfortable footwear, hydration stations, and regular rest options help maintain participation over extended periods.

Legal support infrastructure should include legal observers documenting police conduct, emergency contact numbers written on bodies (not just phones, which can be confiscated), designated spokespersons for media, and medics embedded in groups. Documentation of peaceful walking undermines later claims of obstruction or disorder.

How authorities respond—and how movements adapt

Police and security forces have developed standard responses to walking protests, each with weaknesses that organizers exploit.

Dispersal orders require police to provide clear, audible instructions specifying exit routes and allowing reasonable time to comply. Under most legal frameworks, orders can only be issued when there’s clear danger of riot, disorder, or obstruction. Continuous walking that maintains flow makes these justifications harder to establish. Organizers should document any dispersal orders carefully—were they audible? Were exit routes clear? Was sufficient time given?

Kettling—encircling protesters to prevent escape—works poorly against mobile targets. The Hong Kong “be water” approach specifically countered kettling by scattering before encirclement could complete. Pre-planned dispersal routes and rally points let participants reassemble elsewhere if one location becomes untenable.

Identification of leaders drives many police responses, reflecting an assumption that removing organizers collapses movements. Decentralized, leaderless structures frustrate this approach. When Nina Bahinskaya told Belarusian police she was “just out for a walk,” she exemplified how individual participants can deny organizational roles. Encrypted communications and distributed decision-making reduce movement dependence on any single leader.

Digital surveillance has become standard in authoritarian contexts. Hong Kong protesters used laser pointers to blind facial recognition cameras and wore masks despite anti-mask laws. Counter-surveillance tactics continue evolving as technology advances.

The cat-and-mouse dynamic between authorities and movements means tactics must continuously adapt. What worked in Buenos Aires in 1977 required modification for Leipzig in 1989, Istanbul in 1995, Hong Kong in 2019, and Minsk in 2020. Core principles persist—continuous movement, sustained presence, legal ambiguity—but specific implementations evolve.

When mill-ins work and when they don’t

Mill-ins excel in specific situations but aren’t universally applicable. Strategic clarity about when to walk—and when to choose other methods—strengthens movement effectiveness.

Mill-ins work best when:

• Avoiding arrest is crucial for participants
• Long-duration sustained pressure serves strategic goals
• Legal ambiguity benefits the movement
• Indoor or semi-public spaces make other tactics impossible
• Participants have varied physical abilities that walking accommodates
• International visibility and moral authority matter more than immediate concessions
• Regimes care about appearance and legitimacy

Mill-ins struggle when:

• Authorities are willing to use violence regardless of optics
• Immediate disruption is strategically necessary
• The target space is entirely private with no public access norms
• Movement numbers are too small to create visible impact
• Goals require territorial occupation (barricades, blockades)
• Time pressure demands rapid escalation

The Madres succeeded partly because Argentina’s dictatorship, while murderous domestically, cared about international reputation. The Saturday Mothers faced a Turkish government increasingly indifferent to European condemnation. Context shapes which tactics work.

Practical considerations for organizing walking protests

Anyone considering mill-in tactics should address several practical questions.

Route planning: Where exactly will walking occur? What obstacles exist? Where are entry and exit points? Is the space public or private? What permit requirements apply?

Duration goals: Is this a one-time action or the start of an ongoing pattern? Single actions require different logistics than weekly walks planned for years.

Participant preparation: What physical demands does the walking impose? How will accessibility be handled? What should people wear and carry?

Legal readiness: Who are the legal observers? Where is the legal support hotline? What specific laws apply to the chosen location? What documentation practices will be used?

Communication systems: What encrypted platforms will coordinate participants? What hand signals will be used? Who speaks to media?

Authority response plans: What happens if police issue dispersal orders? Where are rally points for reassembly? How will violence or arrests be documented and reported?

Sustainability structures: If planning long-term weekly walking, how will organizers avoid burnout? What rotation systems will maintain fresh participation?

The answers vary by context, but asking the questions systematically prevents foreseeable failures.

The walking continues

From Buenos Aires to Leipzig to Istanbul to Hong Kong, walking in circles has proven itself as a remarkably durable form of resistance. The mill-in exploits a gap in state power: authorities can order people to stop standing, stop sitting, stop blocking—but ordering people to stop walking exposes the arbitrariness of control. Movement creates legal ambiguity. Persistence creates moral authority. The simple act of putting one foot in front of another, repeated week after week, year after year, has outlasted dictatorships and inspired revolutions.

The Madres still walk every Thursday at 3:30 PM. New generations join, carrying photographs of disappeared grandparents alongside newly vanished activists. The walking has become ritual, ceremony, monument. It proves that some protests don’t need to win immediately—they just need to keep moving.