But the most vulnerable of us are new grads or people with little experience, and most of the time the abuse from the bosses falls in a gray zone, where it is not clearly illegal, but still very damaging for the future of our careers. And no laws or unions will protect you from that kind of environment.
It's also worth mentioning, with respect to Germany specifically, that there are a lot of anti-worker customs that would make Americans gasp. For example, the quasi-requirement of having pictures and other personal information on your CV, the fact that racial discrimination is an open secret even though there are laws against it, the requirement of a reference letter from your previous employer, the glass ceiling that you will encounter frequently unless you are part of the right demographic to break into management ... I could go on.
As an employee in Germany, I feel abused and helpless. Most of the laws on the books are not written to protect me. The only thing that really protects people like me is a competitive job market.