Pierre-Joseph Proudhon (1809-1865) was one of Europe's most well-known socialists during his lifetime. His complete works span over sixty volumes. From his opening salvo on the social origins of the Sabbath, to the claim that "all property is theft!," to his final writings on international relations, federalism, and the political capacity of the working class, his works shaped European socialism for a generation, and continue to act as the intellectual spine of modern anarchism. Paul Sharkey is one of the most well-known and highly respected translators of anarchist writings of the past thirty years. He has translated works by Kropotkin, Malatesta, Proudhon, and many more. He lives in Ireland. Alex Prichard is Associate Professor of International Relations at the University of Exeter. He has written widely on Proudhon's thought and on the political theory of anarchy. His most recent project is Anarchic Agreements: How to Build Groups and Coalitions with PM Press. He resides in England. Alex Prichard is Associate Professor of International Relations at the University of Exeter. He has written widely on Proudhon's thought and on the political theory of anarchy. His most recent project is Anarchic Agreements: How to Build Groups and Coalitions with PM Press. He resides in England.