The Cold War took place between 1948 and 1991 and centered on the antagonism between the two great superpowers, the US and the USSR, each with its allies and areas of influence. If the US had a significant influence in the West, the USSR dominated the countries of Eastern Europe. The USSR violently imposed communist totalitarian regimes after the end of the Second World War in the countries behind the Iron Curtain: the German Democratic Republic, Czechoslovakia, Poland, Hungary, Yugoslavia, Romania, Bulgaria and Albania. The psychological traditions consolidated up to that time were in many of these countries eradicated, meaning the restructuring or abolition of higher education, the abolition of scientific societies and journals. Many psychologists with connections to the Western academic world were purged and persecuted. There was the will to build a new socialist psychology, based strictly on Marxist ideology and Pavlovian physiology. Theories or approaches that did not reflect official ideology were forbidden and labeled as bourgeois pseudoscience. Authorities severely punished psychological practice based on such theories. There were similarities between what happened in these countries, especially in the first decade of the imposition of communism. However, after the death of Joseph Stalin, things developed somewhat differently in each country. Although in some places ideological policies in science had a progressive tendency toward liberalization, in other places there was significant negative interferences throughout the communist period. Due to this diversity, it is somewhat challenging to frame the development of psychology in Eastern Europe during the Cold War from a unitary perspective.