The feud intensified as Kennedy-backed investigations repeatedly brought charges against Hoffa, only for the Teamsters leader to win acquittals and publicly taunt his adversary in Senate hearings, the press, and courtrooms. Hoffa’s fortunes changed after longtime associate Edward Grady Partin secretly cooperated with federal authorities and testified against him. Hoffa was convicted in 1964 of attempting to bribe a grand juror and was later found guilty of misusing a union pension fund. Appeals delayed his imprisonment until 1967, while Kennedy had already left the Justice Department to become a New York senator. After Kennedy’s assassination in Los Angeles in 1968, Hoffa remained a powerful but increasingly isolated figure. He secured early release in 1971 through an arrangement with President Richard Nixon, yet could not regain control of the Teamsters. In 1975, Hoffa vanished without explanation and was never seen again, leaving behind one of the most enduring mysteries in American criminal history.
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