Jimmy Hoffa's disappearance in 1975 is one of the biggest unsolved mysteries in American history, and authorities say it's unlikely that any definitive answers will emerge nearly five decades later.

His full name is James Riddle Hoffa. But everyone knew him as Jimmy. A labor leader who thrived in the rough and tumble world of union organizing, of contracts, and picket lines ... and of standing up ...

DETROIT, Michigan (WWJ) — Wednesday marks 50 years since the former labor union leader Jimmy Hoffa was last seen alive in Metro Detroit, and his whereabouts have yet to be resolved. James Riddle ...

Jimmy Hoffa disappeared July 30, 1975, from the parking lot of the Machus Red Fox restaurant in Bloomfield Township. Investigators theorize he was killed to prevent him from returning to power within ...

In this photo from August 1958, American labor leader Jimmy Hoffa, president of the Teamsters union, testifies at a hearing investigating labor rackets. Hoffa disappeared in 1975, and no body has ever ...