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Lev Borisovich Kamenev[a] (born Leo Rosenfeld or Lev Borisovich Rozenfeld;[b] 18 July [O.S. 6 July] 1883 – 25 August 1936) was one of the leaders of the Russian Revolution in Russia. He was in office from 6 July 1923 to 16 January 1926. He was against the Tsar.