The history of anarchist-Marxist relations is usually told as a history of factionalism and division. This collection of essays, based on original research and written especially for this collection, reveals some of the enduring sores in the revolutionary socialist movement in order to explore the important, too often neglected left-libertarian currents that have thrived in revolutionary socialist movements. Contributors include Paul Blackledge, Lewis H. Mates, Renzo Llorente, Carl Levy, Christian Høgsbjerg, Andrew Cornell, Benoît Challand, Jean-Christophe Angaut, Toby Boraman, and David Bates.