Timeline of the Crimes in The Irishman Movie
All the Events of The Irishman in Chronological Order, Because It's Just a Little Confusing
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Despite the promise Hoffa made to Nixon, he couldn't stay away from union activities. He started off trying to initiate a comeback at the local level with Local 299 in Detroit — where he still had associates and influence — but eventually, he set his sights on running again for presidency of the union. Unfortunately, Mafia kingpins didn't want him to regain control of the Teamsters. They worried that Hoffa would be willing to trade information to the Justice Department in exchange for lifting the restrictions put on him by Nixon and could no longer trust him. The mob bosses supposedly sent threats to Hoffa's supporters in an attempt to keep Hoffa from running, but Hoffa refused to back down.
Allegedly, Bufalino decided to take more drastic action. Hoffa mysteriously disappeared in July of 1975 from the parking lot of a restaurant outside of Detroit. By 1982, he was declared legally dead, though his body was never found and the case was never closed. Though we can't know for sure, it's widely believed that Bufalino ordered his hitman to stop Hoffa from running again, making Sheeran responsible for Hoffa's almost certain murder.