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Osip Aaronovitch Piatnitsky ( ; Iosif Aronovich Tarshis, 29 January 1882, Kovno Governorate – 29 July, 1938, Moscow), was a Russian revolutionary and Soviet politician. Piatnitsky is best remembered as head of the International Department of the Communist International during the 1920s and early 1930s, a position which made him one of the leading public faces of the international communist movement. Wikipedia