Charles Manson

While young Manson might have looked innocent, he was quite the opposite. He committed strings of burglaries at convenience and grocery stores at the age of 13. Later, he was convicted of several murders on his own, as well as murders carried out by his followers through the joint-responsibility rule.

Jeffrey Lionel Dahmer

Dahmer became a serial killer and sex offender, committing rape, murder and dismemberment of 17 men and boys. His later murders also involved necrophilia and cannibalism.