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Joseph Vissarionovich Stalin ruled over the Soviet Union between 1920 and 1953 acting as the supreme leader of the USSR. Holding the post of the General Secretary of the Central Committee of the Communist Party of the Soviet Union, he was effectively the dictator of the state. Stalin introduced his own highly centralized command economy, launching a period of industrialization and collectivization that resulted in the rapid transformation of the USSR from an agrarian society into an industrial global power. Between 1934 and 1939 Stalin mercilessly carried out a series of massive political extra-judicial executions, known as the Great Purge, of major Communist Party and government rival figures as well as many Red Army high commanders without any proper trials - all convicted of alleged treason or considered a threat. These “enemies of the working class” were imprisoned, exiled, sent to forced labor camps or executed, without due process.In the meantime, Germany revitalized under Adolf Hitler’s leadership, worked to revise the post-World War I organizational structure of Europe, imposed by the United States, England, and France. Hitler and Stalin seemed to be natural enemies. Hitler loathed the Communists and Stalin publically denounced the Nazis. The two regimes were ideological enemies and it seemed to many observers that a war between the two was inevitable at some stage<ref.> Boobbyer, Phillip The Stalin Era (Routledge, London, 2000), p. 178</ref>.