I mean, bosses literally hired armed thugs to shoot labor organizers. There’s a damn good reason why labor activists don’t trust the bosses; they shouldn’t.
By this logic, the average person shouldn't trust union bosses, as there are incidents where union bosses commit violence to achieve their ends (the mob/racketeering history).
If you can prove that violence among labor organizers was more prevalent than violence by bosses towards workers, I’d like to see it. I personally am quite dubious.
