But they reveal little that was not already known.not "At no point do these files suggest that the FBI investigated Senator Kennedy for a criminal violation or as a security threat," the FBI said. "The bulk of this material concerns FBI investigation of threats of violence and other extortion claims against Senator Kennedy and other public officials."
Although Kennedy made an unsuccessful run at the presidency in 1980, fears that he too would be killed were ever present, and may have prompted his decision not to run again in 1984.
"These threats originated from multiple sources, including individuals, anonymous persons, and members of radical groups such as the Ku Klux Klan, 'Minutemen' organizations, and the National Socialist White People?s Party," the FBI said.
The documents also refer to threats from individuals angered by Kennedy's stance on Northern Ireland, and allegations of an alleged Mafia plot to kill the three Kennedy brothers.
Among them were letters threatening Kennedy just months after his brother Bobby was shot to death while campaigning for the presidency in Los Angeles on June 5, 1968.