I've been binge-watching Killing Eve (Villanelle rocks) and the subject of villains seemed like a decent/indecent topic.
So... Who are your favorite or most hated villains in history, movies, television, literature, EE (Hi GMR), etc.
I'll start with some obvious ones.
History
(tie) Joseph Stalin and Adolph Hitler
Two of the biggest mass murderers in history. Enough said.