This book makes a relevant contribution to a Marxist critical explanation of social conflicts, social movements and protests. There is abundant literature on social conflict and social movements from Marxist perspectives. However, rigorous criticism, both theoretical and methodological, is scarce. The objective of this volume is the collection of works developing a critical reflection on the categories of theories about contentious collective action and social movements from a Marxist perspective. In order to better understand these phenomena and go beyond their mere case description, the theory needs to be improved. To that end, the book also promotes the debate between Marxisms and the collective action and new social movements in a renewed way. Here different Marxist arguments consider not only their methodological and ideological bias, but also the specific conceptual contributions of those theories.