Personal papers: correspondence between Benedikt Kautsky and his wife Gerda Kautsky-Brunn (photocopies) 1938-1945, with his brother Felix Kautsky 1945-1952, his nephew Hans Kautsky 1945-1954 and his parents Karl and Luise Kautsky; correspondence with Friedrich Adler, Otto Braun, Julius Braunthal, Paul Hertz, Bruno Kreisky, Georg Ledebour, Theodor Liebknecht, Gustav Mayer, Paul Olberg, Roman Rosdolsky, Georges Scheuer, Živko Topaloviç and others 1945-1960; manuscripts and proofs 1946-1957, including `Teufel und Verdammte' and his unpublished biography of August Bebel; file on the publication of `Teufel und Verdammte' in the USA 1947-1949; press clippings of his articles 1947-1953, 1962; Papers of relatives: some letters (photocopies) by Gerda Kautsky 1944-1945; personal documents of members of the Kautsky family 1839-1942, including Karl and Luise Kautsky; some manuscripts by Karl Kautsky. NB. Originals of the photocopies were in private possession, originals were transferred to the IISH in 2014. Accrual 2014: correspondence between Benedikt and Gerda Kautsky 1922-1959; letters from Oda Lerda-Olberg to Karl Kautsky, Jr 1945; letters from a.o. Julius Deutsch, Ruth Eckstein, Wilhelm Ellenbogen, Otto Leichter, and Reynold Pollak to Karl Kautsky, Jr. on the occasion of the liberation of Benedikt Kautsky 1945; letter ‘Das Märchen’ from Lucie Adelsberger to Karl Kautsky, Jr and other documents from and on Lucie Adelsberger 1945-1946; letter from Luise Kautsky to her friends 1941; correspondence between Felix Kautsky and Heinz Umrath on Luise Kautsky 1945.