Alz and aggressive behavior. What can family do?

I saw a man the other day w Alz who was highly aggressive. He was combative,would hit staff and cuss a blue streak would hit other residents who would fight back. What can family in a situation like that do? I know there are specific Alz units, I wonder what they can do when someone goes beserk. In the regular nursing home the papers we signed said they cannot tie a resident down and cannot lock them in a room etc. I know also a lot of times the kindest most pleasant people turn into the above mentioned when Alz takes its grip. So tragic.