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Social movements are one of the primary ways ordinary people attempt to change the world around them. As a subfield of sociology, the study of social movements examines the conditions under which collective action emerges, how it is organized and sustained, why it takes the forms it does, and what it actually accomplishes. Rather than focusing on individual protestors or single events, sociologists treat movements as sustained, organized efforts by a relatively large number of people to promote or resist change in society, typically operating outside formal political institutions. The field asks a deceptively simple set of questions: Why do people mobilize? How do they decide what to do? And what difference does it make?
The intellectual origins of the field lie in late nineteenth- and early twentieth-century concerns about collective behavior. Early European sociologists, influenced by the upheavals of industrialization and revolution, were fascinated by crowds, panics, fads, and riots. Figures such as Gustave Le Bon portrayed crowds as irrational, suggestible masses driven by emotion and contagion. This "collective behavior" tradition, later developed by American sociologists like Robert Park and Herbert Blumer, treated movements as a somewhat abnormal form of social action—a breakdown of normal institutional routines. The underlying assumption was that people join movements because of psychological strain, frustration, or anomie, and that participation is a release of accumulated grievances rather than a calculated political act.
This early framework set the terms for what would become the field's central debate. Was collective action a symptom of social pathology, or a legitimate, even rational, form of politics? By the 1960s and 1970s, the civil rights movement, anti-war protests, and student uprisings made the older view untenable. Participants were not marginal or deranged; they were often educated, organized, and strategic. This historical shift prompted a fundamental reorientation. Sociologists began to ask not why movements were pathological, but how they worked.
The first major paradigm to emerge from this reorientation was resource mobilization theory. Developed in the 1970s by scholars such as John McCarthy and Mayer Zald, it rejected the idea that grievances alone explain protest. Grievances, the argument went, are always present in some form; what varies is the capacity to act on them. That capacity depends on resources: money, labor, organizational infrastructure, communication networks, and access to elites. Movements, in this view, are not spontaneous eruptions but organized enterprises that compete for resources in a broader "social movement industry." Protest is a rational strategy available to groups that lack other political access.
Resource mobilization theory was a decisive break with the collective behavior tradition. It brought movements into the mainstream of sociological analysis by treating them as normal political actors. Its limits, however, soon became apparent. It tended to focus on well-organized, professionalized movements in wealthy democracies, and it had difficulty explaining the passion, sacrifice, and moral commitment that movements often demand. It also struggled to account for why people participate when the personal costs are high and the collective benefits are uncertain—a problem that the next major approach took as its starting point.
Around the same period, political process theory shifted attention from the internal resources of movements to their external political environment. Associated most prominently with Doug McAdam, Charles Tilly, and Sidney Tarrow, this approach argued that movements emerge and succeed when the "structure of political opportunities" opens up. Changes such as electoral realignments, elite divisions, or shifts in state capacity create openings that previously quiescent groups can exploit. The 1960s civil rights movement, for example, was enabled not only by the organizational strength of Black churches and colleges but also by Cold War pressures on the federal government to address racial segregation.
Political process theory added a crucial dimension: movements are not autonomous actors but are embedded in a larger political field. Their fate depends on the state, on allies and opponents, and on the broader configuration of power. This approach also introduced the concept of "repertoires of contention"—the learned, historically specific set of tactics available to a group at a given time. A movement does not invent its strategies from scratch; it draws on what has worked before, adapting familiar forms like the march, the strike, or the petition to new circumstances.
The political process model was enormously influential, but it too had blind spots. Its focus on the state and on formal politics made it less useful for understanding movements aimed at cultural change, identity recognition, or the transformation of everyday life. It also tended to treat political opportunities as objective structures, when in practice they must be perceived and interpreted by movement actors themselves.
The cultural turn in sociology, beginning in the 1980s, produced a third major approach: framing theory. Drawing on the work of Erving Goffman, scholars like David Snow and Robert Benford argued that movements must do more than mobilize resources or exploit opportunities. They must also construct and disseminate "frames"—interpretive schemas that define a situation as unjust, identify responsible parties, and propose collective remedies. The civil rights movement, for instance, framed segregation not as a Southern tradition but as a violation of American democratic values, thereby making it legible and actionable to a national audience.
Framing theory addressed a real gap in the resource mobilization and political process models: the question of meaning. Movements are not just machines for aggregating interests; they are also sites where identities are forged, grievances are articulated, and solidarity is produced. This insight opened the door to a broader concern with culture, including movement rituals, narratives, emotions, and the symbolic dimensions of protest. It also connected the study of social movements to wider debates in sociology about the role of culture in social life.
The cultural turn did not replace the earlier approaches so much as complicate them. Contemporary scholars typically treat framing, resources, and political opportunities as interacting dimensions of movement activity. A movement needs resources to act, opportunities to act upon, and frames to make action meaningful. The question is how these elements combine in specific cases.
A parallel development, more prominent in European sociology, questioned the very object of study. The "new social movements" approach, associated with thinkers like Alberto Melucci and Claus Offe, argued that the movements that emerged after 1968—feminism, environmentalism, peace, LGBTQ rights—were fundamentally different from the labor movements of the nineteenth and early twentieth centuries. The old movements were organized around class and economic redistribution; the new ones were organized around identity, autonomy, and the quality of life. Their goals were not to seize state power but to transform civil society, to challenge cultural codes, and to create new forms of collective identity.
This approach was less a unified theory than a family of arguments, but it made a lasting contribution by insisting that movements are not merely instrumental means to political ends. They are also ends in themselves—spaces where people experiment with alternative ways of living and being. The emphasis on identity and culture dovetailed with framing theory, but it went further, suggesting that the very distinction between "politics" and "culture" is part of what movements contest.
Critics of the new social movements approach argued that it overstated the novelty of post-1968 movements and understated the continuing importance of class and economic issues. The distinction between "old" and "new" movements has proven difficult to maintain empirically. Nevertheless, the approach permanently broadened the field's sense of what counts as a movement and what counts as movement success.
A more recent development, associated especially with Charles Tilly and his collaborators, has been the "relational" or "mechanism-based" approach. Tilly, who had been a central figure in political process theory, moved in his later work toward a more dynamic and fine-grained analysis. Instead of treating movements as coherent actors confronting a stable political structure, he proposed analyzing the recurring mechanisms—such as brokerage, diffusion, and repression—that connect actors, events, and contexts. This approach is less interested in explaining why movements emerge in general than in explaining how specific episodes of contention unfold.
The relational turn reflects a broader trend in sociology toward processual and configurational explanations. It is not a rival paradigm in the same sense as resource mobilization or framing theory; rather, it is a methodological and theoretical orientation that cuts across them. It has been particularly influential in the study of revolution, civil war, and other forms of "contentious politics" that blur the boundary between social movements and other political phenomena.
The field today is characterized less by competing paradigms than by a shared, if uneasy, synthesis. Most scholars accept that movements are shaped by resources, opportunities, frames, and identities, and that these factors interact in complex ways. The major debates now concern emphasis and method rather than fundamental assumptions. Some researchers focus on the micro-dynamics of protest, using ethnographic observation and interviews to understand how individuals become activists. Others work at the macro-level, using comparative-historical methods to trace the long-term trajectories of movements and their effects on states and societies. Still others use quantitative methods to analyze protest events, organizational networks, or the diffusion of tactics across borders.
One important area of contemporary research concerns movement outcomes. Early work tended to assume that movements either succeeded or failed in straightforward terms, but scholars now recognize that outcomes are multiple, indirect, and often unintended. A movement may fail to change policy but succeed in shifting public opinion, building organizational capacity, or transforming the lives of its participants. It may win formal concessions that are never implemented, or it may provoke a backlash that outweighs its gains. The study of outcomes has become more sophisticated, but it remains methodologically difficult because movements are only one factor among many that shape political and social change.
Another growing area is the study of movements beyond the West. The field's early theories were developed primarily in and about the United States and Western Europe, and they carry the assumptions of those contexts. The political process model, for example, presupposes a relatively open, democratic state with a civil society that can sustain autonomous organizations. It fits less well in authoritarian settings, where movements must operate clandestinely, or in postcolonial contexts, where the boundaries between state, society, and international actors are drawn differently. Scholars have responded by developing concepts like "authoritarian resilience" and by attending to the transnational dimensions of contention—the ways movements borrow tactics, build alliances, and target institutions across borders.
The field has also been reshaped by the digital turn. Social media platforms have changed how movements communicate, recruit, and coordinate, as seen in events like the Arab Spring uprisings or the global climate strikes. Early claims that digital technologies would make movements leaderless, spontaneous, and irresistible have proven overstated; the empirical record is mixed. But the study of digital activism has raised new questions about the relationship between online and offline action, the role of algorithms in shaping visibility, and the possibilities for surveillance and repression that new technologies also enable.
Beneath these theoretical and methodological shifts, the field's enduring questions remain remarkably stable. Why do people risk their safety, their livelihoods, and sometimes their lives to challenge powerful institutions? How do movements sustain commitment over time, through defeats and disappointments? What makes some movements more effective than others at winning allies, shaping public debate, and forcing change? And what is the relationship between movements and the larger social structures they seek to alter—are they symptoms of social strain, expressions of collective will, or engines of historical transformation?
The study of social movements is thus not a settled body of knowledge but a living conversation. Its theories are tools for asking better questions, not final answers. What unites the field is a conviction that collective action matters—that the seemingly chaotic and unpredictable world of protest, organizing, and resistance is, in fact, patterned, intelligible, and consequential.