If you’ve been wondering where to find more information on the disappearance of James Hoffa, you’ve come to the right place. If you’re like most people, you’ve likely been curious about how to proceed in a case involving missing labor union leaders. The investigation into the disappearance of Hoffa is being conducted by the Detroit field office of the F.B.I. The most important thing to keep in mind is that you’re not the only one who should know about the investigation into the ‘blacklist’ of union leaders.