Yeah, power corrupts.

As Tas has pointed out, the NLRB issue arose because the Boeing execs were dumb enough to openly threaten the unions.

Lots of unions are corrupt as hell and all around messed up. Some unions do a good job of representing their workers and strike a good balance.

Unfortunately , I doubt it is possible to use legislation to keep unions honest.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)