14. The Kray Twins
Reggie and Reginald Kray ruled the East End of London. They built their criminal empire in the 1950s and 60s. The Krays claimed the title of the most evil men in Britain. They owned swanky nightclubs all while establishing their gang called the Firm. The twins were known for their brutality. They killed within their gang and even killed Frank “The Mad Axeman” shortly after they helped him escape prison.