Description:Employing new methods of conceptual and institutional analysis, and drawing on extensive original archival research, this book examines the efforts of leading political theorists to transform the initially distinctive theories of the British and American lefts into a single unified ideology. In so doing it challenges traditional narratives emphasising the exceptional development the American and British lefts, and argues instead that the central theoretical and practical commitments of both movements were constantly shaped and reshaped by international ideological exchange.