Yeah, like what the achieved in public schools, or police forces and blue wall, or American auto industry... not quite a union but AMA has also achieved a lot for US doctor pay vs the rest of the world. American West Coast port efficiency is also the laughing stock of the world, thanks in no small part to unions. And feather bedded and/or mafia-run infrastructure costs in places like New York.. oh yeah, I'm forgetting the glorious history of unions! That's where it really is, like explicitly racist exclusion during the Great Migration, or volunteer patrols Cesar Chavez used to run to intimidate undocumented immigrants with violence and bribe officials to look the other way.
I personally think, with the exception of those explicitly dedicated to violence or war, American-style unions are the most evil organizations on the planet. If someone paid me to invent a social structure with worse all-around incentives, I probably couldn't do it.