This open access book explores how polycrises not only generate new forms of inequality and social exclusion but also inspire new political activism, solidarity, and citizenship. It examines how social movement organizations frame their responses to exclusionary policies and regimes, and sheds light on their strategies for mobilization. By focusing on contemporary movements and their framing of social issues in times of crisis, the book offers valuable insights into social movement studies, urban studies, political communication, and frame analysis. It also engages with broader theoretical and public discussions on solidarity and citizenship. This book is ideal for scholars and students interested in social movements, political struggles, and fields such as migration, housing, and care.