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About the top three academic journals on the field of social movement studies:

Interface: A Journal for and About Social Movements is an open access academic journal that covers original research and reviews of books concerned mainly with protests, social movements, and collective behavior.  In 2017 Interface was listed by Stefan Berger and Holger Nehrin, in their book The History of Social Movements in Global Perspective, as one of the "main academic journals" in the field of social movement studies, alongside Mobilization and Social Movement Studies. – Link 

Additional useful source: Moving the Social: Journal of Social History and the History of Social Movements.