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Joseph Stalin is remembered as one of the bloodiest tyrants in the history of the world. He was the absolute ruler of the Soviet Union and later of the Communist bloc in Easter Europe. How he He rose to such an this unprecedented level of power was as a result of his own personal capabilities and especially his understanding of the workings of the Communist Power, which that had total control of the Soviet Union after the Russian Civil War (1917-1920). Stalin was not the natural successor of Lenin, but he was able to use his position within the Soviet Communist Party to become the undisputed leader of the Soviet Union. <ref>Boobbyer, Phillip ''The Stalin Era'' (Routledge, London, 2000), p. 78</ref>