James Riddle Hoffa was an American labor union leader who served as the president of the International Brotherhood of Teamsters from 1957 until 1971. From an early age, Hoffa was a union activist, and he became an important regional figure with the IBT by his mid-twenties. It is likely that he was murdered by members of the Mafia, but it's a complicated story.Here's the best podcast episodes about Jimmy Hoffa and his disappearance.