The US once had a rich history of unions for 100's of years since the 17th century, and plenty of wars over them where the US government literally attacked union workers in wars like Battle of Blair Mountain.
The US seems to have almost wiped out this history and few people know who died for these movements and few people realize we have had bloody battles, I never really learned it in school but it's pretty darn American to have unions and die for your rights.
Sure there is corruption but literally every system does, that doesn't make people stop using it. If we had better union power we would not see the poor treatment of Amazon workers, or game testers, or retail works. Heck, one day we may make a requirement to have a vacation day, imagine how crazy that would be if vacation time was written into a work law! Almost imagine that Russia, South Africa and many other countries have literally better labor laws then America not to mention the EU.
I was quite shocked how bad our labor laws were when I looked into it further because I assumed a lot, makes it hard to be human in the US. At will employee with literally no time off is perfectly legal here, but I hope one day paid vacations (even just a few days) are requirement for all full time employees at least.