Dictator
Kings and emperors often use force and fear too, but usually they are not called dictators.  This is because those monarchs have some reason for being in power (usually their father was king or emperor), but a dictator gained power himself. Also, when someone is king or emperor of a country, usually there were several kings or emperors before them. A dictator often creates the job of dictator by gaining power. The most brutal dictators are Adolf Hitler,Joseph Stalin,Benito Mussolini,Chiang Kai-Shek,Mao Zedong,Kim Il-Sung and Pol Pot .