text: why was the u.s so opposed to communism in the 1950s? 1.the korean war 2.spies at home 3.communist expansion laggression in europe communism and socialism were the most imp. threat for us at that time. soviet union and china had emerged as powerful communist nations added with numerous other states. peoples movement were going on and communists were strong in many coutries in asia and latin america. a large area of the world were under the ideological influence of communism and communism became popular among people from exploited and underdeveloped society. these were against the capitalistic and imperialist interest of many coutries. us was one of them.