If they have banned it/them, it is apparent that the board believes it has such power. Presuming it does, the issue is whether its discretionary authority edict invades unreasonably your first amendment rights. You might have some sort of an appeal from the decision, but my guess is you will have to file a civil rights case to have your question answered by a court. Good luck.
Answered on Aug 26th, 2015 at 9:03 AM