Mao Zedong
Mao is known for single-handedly destroying traditional Chinese culture with his communistic strategies and altering the economy from agrarian to industrial. Under his dictatorship, 40 to 70 million people are estimated to have died through starvation, executions, and forced labor.
Benito Mussolini
He had no hesitation slaughtering entire villages that harbored protesters. During World War II, he sided with Hitler to the disagreement of many of his people. Eventually, he was captured and executed by Italian rebels.