What about Leopold II who killed more than 15 million Congolese?
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The All-Time Worst People in History
1. Adolf Hitler 
2. Pol Pot 
3. Heinrich Himmler
4. Kim Jong-il 
5. Mao Zedong 
6. Kim Il-sung
7. Idi Amin 
8. Jim Jones 
9. Josef Mengele
10. Ted Bundy
11. Osama bin Laden 
12. Kim Jong-un
13. Joseph
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2. Pol Pot
3. Heinrich Himmler
4. Kim Jong-il
5. Mao Zedong
6. Kim Il-sung
7. Idi Amin
8. Jim Jones
9. Josef Mengele
10. Ted Bundy
11. Osama bin Laden
12. Kim Jong-un
13. Joseph