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Period 1892-1945
Extensive correspondence with his wife Lydia 1897-1916, with his sister Hedwig Wille-Brupbacher c. 1897-1928, with James Guillaume 1905-1916, 1920 and Max Nettlau (1906-) 1921-1940; correspondence (partly also directed to Paulette Raygrodski) with Luigi Bertoni 1906-1907, 1917-1940, Ottavio Dinale 1...
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Period 1892-1945
Correspondence with family members and with Friedrich Adler, Vera Figner, Max Friedemann, Rudolf Hahn, Max Horkheimer, Otto Lang, Georg Ledebour, Willi M├╝nzenberg, Wilhelm Reich, Alfred Sanftleben, Victor Serge and many others. NB. Originals at the Schweizerisches Sozialarchiv, Zurich.
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