From the facts that you've described, your supervisor may be a poor manager, however, what he's done is not illegal. Not all forms of different treatment are against the law. It's only against the law if the supervisor has an illegal motivation (e.g., is doing it BECAUSE OF your race, age, gender, national origin, disability, religion, or pregnancy.
What does this mean, botXXXXX XXXXXne? It means that you have no recourse through the EEOC
or courts. You can talk with management and/or you can work through your union. But those are your only options. The courthouse can't help.
I know that this is not what you wanted to hear but you deserve a candid answer. I wish very much that I could offer you an answer that was more favorable to your circumstances, but the law seems to be pretty clear. Had I been able to provide an Answer which might have given you a successful outcome, it would have been my pleasure to do so.
I hope you understand.
My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back. I am happy to address follow-up questions. Thank you for your business!