If you have to go back to someone who disappeared (and probably died) in 1975 for an example of why unions are corrupt, I don’t think you have much of an argument.
Hoffa and Taylor have chosen to deliberately ignore the wishes of UPS Teamsters and side with the company against their own members, despite significant portions of the UPS Teamsters who want to take the fight to the company. In June, 90 percent of UPS and UPS Freight Teamsters voted to authorize a strike, and now a majority of UPSers have voted down both Teamsters contracts. Hoffa and Taylor don’t care.