Populist Mobilization presents a novel theoretical framework for the study of grassroots populist movements. Integrating Laclauian discourse analysis with collective action frame theory, it examines two cases studies from the protest cycle of the Great Recession: the Icelandic Pots and Pans Revolution and the Greek indignados. Drawing from semi-structured interviews with activists and an extensive analysis of the movements’ paper trail and audiovisual material, it explores organizational aspects, processes of collective action framing, the construction of collective identities, and the influence of cultural elements. Additionally, the book embarks on a historical exploration of the intellectual roots of populism to dispel the pejorative connotations attached to the concept and advocates for a collaboration between sociologists and political scientists on a comprehensive research agenda for the populist phenomenon that transcends the institutional/non-institutional divide.