Britain's most notorious gangsters of all time were East-end duo, identical twin brothers Ronnie and Reggie Kray. They went from rags to riches and became legends in their own time. Throughout the Swinging Sixties, the Kray twins unleashed a reign of psychotic terror across London's crime-ridden East End, leaving a gruesome trail of violence and murder in their path. Though they spent most of their lives in jail, their legend continues to both haunt and enthral. When they died, their funerals were like royalty. Tens of thousands turned out in London's East End. On his deathbed, Reg said, "I would do it all again". See how they achieved a level of celebrity, all while running their nefarious operations, hear stories from ex-gangsters, safe crackers and crooks and discover how they were finally captured and convicted in this fascinating programme.