Top Ten Most Evil Dictators of All Time (in order of kill count)
http://www.popten.net/201[...]e-in-order-of-kill-count/

10. Yakubu Gowon (1.1 million deaths)
9. Mengistu Haile Mariam (400,000 – 1.5 million deaths)
8. Kim Il Sung (1.6 million deaths)
7. Pol Pot (1.7 million deaths)
6. Ismail Enver Pasha (2.5 million deaths)
5. Hideki Tojo (5 million deaths)
4. Leopold II of Belgium (2-15 million deaths)
3. Adolf Hitler (17 million deaths)
2. Jozef Stalin (23 million deaths)
1. Mao Zedong (49-78 million deaths)