English summary: This volume contains analyses and previously unpublished documents concerning Robert Havemann and his evolution to becoming an opponent of the SED regime. No other intellectual in the GDR was such a harsh opponent of the SED regime as Robert Havemann. A Communist and a Nazi resistance fighter through and through, Havemann was one of the leaders in erecting the new GDR. His advocacy against all forms of social and political subjugation, however, eventually turned him into an opponent of the reigning regime of the GDR. The contributions in this volume illuminate his development...