The Cold War between communist and capitalist states involved espionage and preparation for war between powerful nations, along with political and military interference by powerful states in the internal affairs of less powerful nations. Poor outcomes from some of these activities set the stage for disillusionment with, and distrust of, post-war governments. Examples included harsh responses from Soviet Union (USSR) towards popular anti-communist uprisings, such as the 1956 Hungarian Revolution and Czechoslovakia's Prague Spring in 1968; and the botched U.S. Bay of Pigs Invasion of Cuba in 1961.