It's not just the Wagner Act. I can't recall the exact Supreme Court case, but around the middle of the 20th Century, unions and management were essentially re

It's not just the Wagner Act. I can't recall the exact Supreme Court case, but around the middle of the 20th Century, unions and management were essentially required to have that overly adversarial relationship by equal representation requirements. AIUI, in Germany, if you're a goofball, the union can agree with the company that you shouldn't work there. In the US, absent criminality, the union is required to protect every member with equal vigor. (The original case was brought because of racial discrimination within the union, so I can understand how we got here...)