A few years ago I read a book written by 2 agents who worked on the Hoffa case for years and they said that one day in the early 80's, the deputy director of the FBI came into their office and shut down their unit. Officially it was because it was being moved to being a cold case. But they found out later a top mobster had flipped and that is when Tony Pro, Sally Buggs and a couple of other guys were all named as suspects and that was that. While officially it is still open, most FBI guys from that era and were involved agree they know the who, the what and most of the where. They just have no idea where Hoffa is buried. There are three mobsters from that era that are alive and are talking and surprisingly they are telling a smilier story. Frank Collotta, Michael Franzese and a third guy who's name slips my mind right now. They all say it was Pro and Buggs who arranged it.