Labor Lawyers Advice?

Here, let me put it in it's simplest form. Only the Company can fire or discipline people.

What you assume is that the Union has power which it does not have.

Neither you nor I said anything about the union firing anybody. That is a different thing altogether. You asked what should they do, I said lots. For instance the union could strike. I can think of other things. Someone who is a danger to everyone else needs to be gone.