FBI documents have revealed that the son of gangster Al Capone had threatened to assassinate Edward Kennedy - three weeks after the senator's brother Robert Kennedy was gunned down in Los Angeles.
Albert "Sonny" Capone was heard in a Miami restaurant in 1968 saying Edward Kennedy might "get it too".
The story has fuelled speculation that mobsters were involved in the assassination of President John F Kennedy in 1963.
Ted Kennedy died of cancer in 2009 and Albert "Sonny" Capone died in 2004.
PICTURE: (from left) Robert F. Kennedy, Edward Kennedy, President John F Kennedy. Taken in 1962
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