Unions are implemented differently in the US and elsewhere. IMHO the case law around unions in the US sets up a perverse incentive structure that results in an antagonistic relationship between capital and labor, ex: Supreme Court ruling requires that unions protect all of their members from firing, even the obviously terrible ones, this has resulted in huge inefficiencies for workers AND capital alike. Other countries like Germany have better union implementations, such that the union usually has a seat on the board of directors and is able to better set company policy in a non antagonistic non zero sum way.