Mussolini started the fascist movement and was doing some serious aura farming ,as the kids would say. Going for rebuilding the Roman Empire would be a serious Minion bait.

Hitler passed him in evilness and had a penchant for ridiculous super weapons. Some of the cockups they had could have been Minion level.

Stalin was neck and neck with Hitler for evil, murder, and conquest. However, I think by the time they turn his way, the Minions would have looked at all the purges, holodomor, etc and just decided to take a personal vacation until the CIA showes up.