Jimmy Hoffa in prosecutions arising from the Watergate scandal by mid-1973, had drafted the non-participation clause in 1971 at Nixon's request. Hoffa ultimately lost his court battle, since the court ruled that Nixon had acted within his powers by imposing the restriction, as it was based on Hoffa's misconduct while serving as a Teamsters' official. Hoffa faced immense resistance to his re-establishment of power from many corners and had lost much of his earlier support, even in the Detroit area. As a result, he intended to begin his comeback at the local level with Local 299 in Detroit, where he retained some
Jimmy Hoffa assaulted. The threats from the mafia that they would get rid of Hoffa were taken very seriously; Hoffa's son is quoted as saying "Dad was pushing so hard to get back in office, I was increasingly afraid that the mob would do something about it." There had been three visits in a short time frame to Hoffa's home at Lake Orion and one trip to the Guardian Building law offices by Anthony Giacalone, an alleged kingpin in the Detroit Mafia, and his younger brother, Vito. Friendly with Provenzano and believed to be related to him, their avowed purpose in coming