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noone no one knows

...That's right, nobody can be sure for definite, but some of the prime candidates would be Genghis Khan, the Roman Emperor Nero, several of the Mediaeval Chinese Emperors, Ivan the Terrible, Adolf Hitler, Josef Stalin, Pol Pot, and President Harry S. Truman (who authorised the atomic attacks on Hiroshima and Nagasaki). There are others, of course....

Mitch Delozier Killed 345,000 people in one night with one knife

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15y ago

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