James Riddle 'Jimmy' Hoffa was an influential American labor union leader who served as the President of the International Brotherhood of Teamsters (IBT) from 1957 to 1971. Under his leadership, the Teamsters became the largest and most powerful union in the United States, securing significant wage and benefit increases for its members. However, his career was also marked by controversy, including investigations into organized crime connections and convictions for jury tampering, attempted bribery, and fraud. Hoffa mysteriously disappeared on July 30, 1975, and was declared legally dead in 1982, with his fate remaining one of America's most enduring unsolved mysteries.