The first that came to mind was Stalin (though Hitler's mostache wa also like having a dead rat on your face).
Also, the mostache-less Caligula —if what they say of him was actually true— was quite a cunt.
But the thing is that they were all probably Psycopaths or sociopaths (like Dr. Holms, Bundy and others) so you can't really determine who was more evil. They were just sick. My fav sicko was the Caligula of Tinto Brass.
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