For the past two decades efforts to halt the decline in union numbers and revitalize the labour movement have largely resided in social movement unionism (SMU). In the first English-language book to compare SMU in Japan, Korea and the United States, scholars from the three countries examine its emergence as a response to neoliberal globalization. Cross-National Comparisons of Social Movement Unionism moves beyond previous studies of SMU and union revitalization which have focussed on the United States, Canada, the United Kingdom and Australia. The eleven chapters offer empirical and theoretical analyses of the impact of SMU on existing labour movements, and explain the mediating factors that account for the diversity of SMU across national boundaries, arguing that its forms and activities are mediated by different institutional, political and economic contexts.