1. Adolf Hitler – Leader of Nazi Germany, responsible for the Holocaust and World War II atrocities.
2. Joseph Stalin – Leader of the Soviet Union, responsible for the Great Purge and widespread political repression.
3. Pol Pot – Leader of the Khmer Rouge in Cambodia, responsible for the Cambodian genocide.
4. Mao Zedong – Leader of the People's Republic of China, associated with the Great Leap Forward and the Cultural Revolution, which led to mass deaths and suffering.
5. Genghis Khan – Founder of the Mongol Empire, known for his brutal conquests across Asia and Europe.
6. Vlad the Impaler – Ruler of Wallachia, infamous for his cruel methods of punishment, inspiring the Dracula legend.
7. Ivan the Terrible – First Tsar of Russia, known for his violent reign and the establishment of the Oprichnina.
8. Saddam Hussein – President of Iraq, known for his brutal dictatorship, wars, and the repression of his own people.
9. Osama bin Laden – Founder of al-Qaeda, responsible for the September 11, 2001, terrorist attacks in the United States.
10. Attila the Hun – Leader of the Huns, notorious for his invasions and destruction across Europe.