It should be illegal for workers to form a conspiracy for the purpose of shaking down an employer for things they could not gain through merit. Each employee should bargain only for himself/herself.
“...for the purpose of shaking down an employer for things they could not gain through merit.”
Employers take advantage of employees plenty of the time. As for the usual, “so start your own business”, not everyone can own a business.
There are good union employees, there are crappy union employees, and everywhere in between. Just like non union.
See Commonwealth v Hunt