Is membership of the forum still open? It shouldn't be - it should only be open to facebook group members or society members (or basically from some kind of list).
This wouldn't completely solve the problem but would help.
Telling people that only usernames that make your name clear will be approved too would help.
There's no reason to stop non-members reading the forum. But they should have to join in order to post in my opinion.
That's how it was before, but then every time a member/random bot applies for a membership, I or another exec member has to cross-check it with the member database on the union website :/
Hmmm... I wonder if there's a way to do it automtically? I'm guessing not with out a lot of work... :/
I think that we have to accept that controlling who joins the forum involves work - this will decrease after the initial rush of people because this forum is only just being set up. I'm sure all of the exec would be happy to help out - to be honest it sounds as if it should be partly the secretary's job