This work analyses the relationship between Anthropology and the study of social movements. First I introduce the emergence of new types of logic and practices in the field of collective action, which sharply differ from our previous images of organized political actors. Then I explain why Anthropology is particularly suitable to grasp these types of processes, much more so that the dominant approaches in Social Movement Studies, since ethnographic fieldwork enables us to apprehend emerging dynamics as they are being built and deployed. I conclude the article by bringing collaborative anthropology into the discussion, emphasizing the epistemological and methodological features that make this proposal appropriate for implementing research projects simultaneously relevant for the academia as well as for the subjects and social movements that we are working with.