Correspondence, memoranda, writings, speeches, memoirs, minutes of meetings, conference proceedings, leaflets, resolutions, bulletins, reports, clippings, newspapers, other printed matter, sound recordings, and photographs, relating to Karl Marx and the international socialist movement; the First, Second, Third and Fourth Intenationals; Russian revolutionary, anarchist and socialist movements, especially the Rossiĭskai͡a sot͡sial-demokraticheskai͡a rabochai͡a partii͡a (RSDRP) and its Menshevik wing; the Partii͡a sot͡sialistov-revoli͡ut͡sionerov (PSR); the Russian Revolution and Civil War; Russian politics and government in the nineteenth and twentieth centuries; communism in the Soviet Union; Russian émigré politics; the Vlasov movement during World War II; and Russian displaced persons after World War II. Includes records of the RSDRP, the PSR, and other organizations; and papers of Rafail Abramovich, Pavel Aksel'rod, Viktor Chernov, Leon Trotsky, Irakliĭ T͡Sereteli, and many others. Also includes papers of B. I. Nicolaevsky. Also available on microfilm (796 reels). Sound use copies of sound recordings available.