Totalitarianism
Centralized control by an autocratic authority. Stalin lead a totalitarian government in Russia during the Cold War. Mussolini, Hitler, Tojo, and Franco were also leaders of totalitarianism.
Fascist
A political philosophy, movement, or regime that exalts nation and often race above the individual and that stands for a centralized autocratic government headed by a dictator leader, severe economic and social regimentation, and forcible suppression of opposition. Benito Mussolini was the first leader of the first fascist movement. He ruled Italy from 1922 until the Italian defeat in WW2.
Communist
Mao Zedong took control over China in 1949 and proclaimed China as the People's Republic of China. During the reign of the Soviet Union, there were communist countries throughout Eastern Europe, Asia, and Africa. Today there are only five communist countries in the world.
Dictator
Hitler, Mussolini, and Stalin were in the top ten dicators. Adolf Hitler plungged Germany into war. Benito Mussolini turned a democratic Roman Empire into a state ruled by a secret police where there was no room for political dissent. Jospeh Stalin is widely regarded to have killed about 20 million people in his oppressive regime.