The collection of essays in Secret Agents and the Memory of Everyday Collaboration in Communist Eastern Europe addresses institutions that develop the concept of collaboration, and examines the function, social representation and history of secret police archives and institutes of national memory that create these histories of collaboration. The essays provide a comparative account of collaboration/participation across differing categories of collaborators and different social milieux throughout East-Central Europe. They also demonstrate how secret police files can be used to produce more subtle social and cultural histories of the socialist dictatorships. By interrogating the ways in which post-socialist cultures produce the idea of, and knowledge about, “collaborators,” the contributing authors provide a nuanced historical conception of “collaboration,” expanding the concept toward broader frameworks of cooperation and political participation to facilitate a better understanding of Eastern European communist regimes.