This edited collection of exciting new scholarship provides comprehensive coverage of the broad sweep of twentieth century religious activism on the American left. The volume covers a diversity of perspectives, including Protestant, Catholic, and Jewish history, and important essays on African- American, Latino, and women's spirituality. Taken together, these essays offer a comparative and long-term perspective on religious groups and social movements often studied in isolation, and fully integrate faith-based action into the history of progressive social movements and politics in the modern United States. It becomes clear that throughout the twentieth century, religious faith has served as a powerful motivator and generator for activism, not