Kennedy's went after Hoffa so hard because with the teamsters he could and would shut down trucking from coast to coast...
My son in an independent trucker and I told him 45 years ago if he tried that he'd either be dead or have a burned out rig, and possibly both....
Possibility might get another conservative, the old union rank and file are dying off, Hoffa's gone and the young of today aren't too big on unions, plus Detroit population and Flint and other union towns have lots of unemployed union workers that don't trust union boss's any more...... At least one can hope....