8. Griselda Blanco

Also known as the Godmother in the crime world, she was the most ruthless gangster in the trading of drugs during the 70s and 80s.

At the age of 11 she took a child hostage and demanded a ransom. She eventually killed him with a bullet in his head.

She was suspected to be suffering from "sociopathic" tendencies and also used to have sex with men forcibly, keeping them on gunpoint.

If she had been alive in this century she would have been the wealthiest self-made woman on this planet.  Her wealth at that time was  $500 million.