Definition of the Kray twins from the Oxford Advanced Learner's Dictionary

 

the Kray twins

 
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two English brothers, Ronnie Kray (1934-95) and Reggie Kray (1934-2000), who led a group of criminals in the East End of London in the 1960s. They were found guilty in 1969 of murdering two men and sent to prison for 30 years. Ronnie Kray died in prison.