5. Pol Pot
Pol Pot or Saloth Sar was the leader of the Khmer Rouge and the Prime Minister of Cambodia between 1975 and 1979. He was responsible for the bloody genocide of Cambodian people that targeted intellectuals and “bourgeois elements” of the society. In just 4 years, he wiped out 20 percent of Cambodian people or 1.5 million lives.