Hitler
IMO, Hitler’s behavior can better be explained by various personality disorders, especially schizotypal, paranoid, and antisocial, than by an autism spectrum condition.
Here is one example of a study on Hitler:
http://web.uccs.edu/fcoolidg/Hitler%20PDF%20unproof.pdf
Even if he might have been on the spectrum, his spectrum condition would likely have been secondary to various personality disorders.