This volume focuses on an important, if often overlooked, way that religion and politics intersect in the United States. Within almost every community, and involved with almost every possible issue or area of public concern, progressive religious activists are a driving force in American public life. Their presence complicates the prevailing wisdom that religion is necessarily conservative and political progressivism is necessarily secular. Yet little is known about these activists, either among the public or within academia. This book brings together a group of leading experts who describe and analyze the inner worlds and public activities of the progressive religious activist field, including chapters on faith-based community organizing, immigrant rights activism, the Plowshares movement, the New Left, and the Nuns on the Bus, among others. Other chapters consider the political engagement of various religious communities, including Mainline Protestants, Buddhists, Hindus, Muslims, and Catholics. Finally, authors consider connections between these activists and the Democratic Party, examine what factors lead congregations to mobilize for progressive causes, and trace the revival of civil religious rhetoric. Taken together, this book challenges common perceptions of religiously motivated social action, and offers new ways of thinking about the American religio-political landscape as a whole.