4. Pol Pot
Without any doubt, Pol Pot was the worst Prime Minister, not just in Cambodian history, but in the history of the world. When becoming one, instead of bringing positive changes and reforms, he proved to be one of the worst things that could happen to this country and its people. He proclaimed genocide against his own nation, killing approximately 1 to 3 million of Cambodians, which is actually one-fourth of the whole population. He was one of the cruelest people since before actually killing, he had the whole process of torturing the innocent citizens.
