My cousin is an electrician. His boss and his union rep pretty regularly attack his wife for being a trans woman and his options are to sit there and smile or to be fired and never get work again. The (whatever the term is for) apprenticeship system is pretty much built around systemic racism and nepotism and there are a LOT of sexual abuse “scandals” that never see the light of day.
A union, by definition, is about giving power to the people. But if the people are shitbags too, it doesn’t change a lot. Its the exact same problem that companies like Activision-Blizzard had where it is a culture of abuse where the c-suite and the middle managers and even the co-workers are doing “cube crawls” and the like. You can give more bargaining power to the workers but that doesn’t help when the workers themselves are abusive.
I am generally pro union but they do not solve anywhere near as many problems as The Internet likes to pretend they do. And I can very much see a case where a lot of the leadership in the medical community have the “Everyone needs to go through a crucible” mentality. Hell, my aunt is a doctor and has even bragged about how many days straight she could work when she was in her residency and so forth.