I have belonged to four unions and negotiated a contract three years ago, before I retired from my last job.  But, you are right most of my experience has been in management.  I quit a well paying job about ten years ago because there was an unwarranted mutiny by managers.  Back in the 1970s when I chaired the grievance committee of my AFGE local, I reviewed many complaints.  But, you deal with them individually, unless it is a group of actions against one individual.  The kind of bundling we see here is unprecedented, in my experience.  It takes on the mood of the villagers with pitchforks and torches.