of the Soviet state as a federative entity of many constituent republics, each with its own political and administrative entities, the term "Soviet Russia" strictly applicable only to the Russian Federative Socialist Republic was often applied. The domination was so absolute that for most of the Soviet Union's existence, it was commonly (but incorrectly) referred to as "Russia". Retrieved 24 November 2008. Moscow was concerned about the Marshall Plan and Comecon was meant to prevent countries in the Soviets' sphere of influence from moving towards that of the Americans and South-East Asia. Archived from the original on 26 December 2008. It was instrumental in the Stalinist terror, 121 but after the death of Stalin, the state security police was brought under strict party control. The Soviet Union had its roots in the 1917 October Revolution, when the Bolsheviks, led by Vladimir Lenin, overthrew the Russian Provisional Government which had replaced Tsar Nicholas II during World War.