Legal Question in Employment Law in California

Talk to your shop steward about your concerns (preferably after hours) and see if things can be adjusted or changed. If that gets you no satisfaction, talk to the district representative.

Your one and only step is to file a grievance of the company actions. Persuasion is your only tool to get the union to help and do so. Talk and plead with everyone in the union you can. Go up the ladder or chain of command as high as you can. Welcome to the reality of union membership and management today.