1. Ted Bundy
The name Ted Bundy is not something only Americans know of. In fact, he was so dangerous and killed so many people, that he was known and feared around the world.
Ted Bundy can easily be considered one of the most cruel serial killers of all time and was not only known for this. He committed many crimes, including kidnapping, raping, stealing and many of this kind. He used to kidnap women, rape them and take their members off, keeping them as souvenirs.
Before being executed in 1989, he confirmed that he killed 30 women, but the actual number of crimes may be way bigger.