3. Sawney Bean (The Hills Have Eyes Series)
Sawney Bean is probably the most unheard of person on this list, but he has one of the most interesting stories. He was the leader of a clan of people in Scotland in the fifteenth or sixteenth century, and his clan had an interesting diet. They were cannibals. The group originally started with Sawney and his wife who had fled to a cave. The rest of the group was made up of their sons and daughters, and the product of their sons and daughters having sons and daughters of their own, which were completely a product of incest. So Sawney led a group of his incestual family to kill innocent people passing by so they could have a nice breakfast. That sounds basically like the same exact plot of any of the Hills Have Eyes movies, and the fact that this movie was based off true events is completely disgusting. The tale goes on to say that King James VI of Scotland took an army on a manhunt of Sawney and after capturing the whole family, the men were led to bleed to death while the women watched. After all the men died, the women were burned alive. I'm not exactly a believer of karma, but in this instance, what went around definitely came back around for Sawney and his family. An interesting segway for our next killer, who also happens to be a cannibal himself.