Which labor leader organized the Teamsters union and disappeared in 1975?

James R. Hoffa was a powerful American labor leader who rose to prominence as the president of the International Brotherhood of Teamsters (IBT). He held the presidency from 1957 to 1971, during which time he significantly expanded the union's membership and influence, notably negotiating the first National Master Freight Agreement in 1964. Under his leadership, the Teamsters grew to become the largest labor union in the United States.

Hoffa's career, however, was also marked by controversy, including allegations of corruption and ties to organized crime. He was convicted in 1964 on charges of jury tampering, attempted bribery, and fraud, leading to his imprisonment in 1967. After serving a portion of his sentence, President Richard Nixon commuted his sentence in 1971, with the stipulation that Hoffa could not engage in union activities until 1980. Despite this condition, Hoffa sought to regain control of the Teamsters, which put him at odds with powerful figures, including those in the Mafia.

The mystery surrounding Hoffa intensified on July 30, 1975, when he disappeared from the parking lot of the Machus Red Fox restaurant in Bloomfield Hills, Michigan. He was scheduled to meet with two known mob figures, Anthony Provenzano and Anthony Giacalone, both of whom later denied having seen him. Despite extensive investigations by the FBI, his body has never been found, and the circumstances of his disappearance remain one of America's most enduring unsolved mysteries. Hoffa was legally declared presumed dead in 1982, with many believing he was murdered by the Mafia to prevent his return to power within the Teamsters.