History of the Soviet Union (1964–82) Brezhnev remained wary of any sort of intervention and Kosygin reminded leaders of the consequences of the Soviet suppression of the 1956 Hungarian revolution. In the aftermath of the invasion the Brezhnev Doctrine was introduced; it stated that the Soviet Union had the right to intervene in any socialist country on the road to communism which was deviating from the communist norm of development. The doctrine was condemned by Romania, Albania and Yugoslavia. As a result, the worldwide communist movement became poly-centric, meaning that the Soviet Union lost its role as 'leader' of the world communist movement. In the aftermath
Censorship of images in the Soviet Union was also among the first members of the Politburo. He became an enemy of the State and was erased from Soviet history after leading the failed struggle of the Left Opposition against the policies and rise of Joseph Stalin in the 1920s and the increasing bureaucratization of the Soviet Union. Trotsky was expelled from the Communist Party and deported from the Soviet Union in the Great Purge. As the head of the Fourth International, he continued in exile to oppose the Stalinist bureaucracy in the Soviet Union, and was eventually assassinated in Mexico by Ramón Mercader, a Soviet agent who