You should think over a federation policy and baseline behavior policy/ToS (and possibly disable sign-ups if you think you can't handle that right now) and discuss it with the members.

You should probably investigate what all these different groups are, and learn to recognize the signs of dishonest argumentation, like the most frequent styles of whataboutism, poisoning the well, brigading (even the non-argumentative variants which can also be called a Sybil attack, pretending to be the victim (usually using dogwhistles), etc.

If you recognize malicious tactics you're in a much better position to call bullshit on trolls (and also remember sometimes both sides on a conflict is wrong, so beware of taking sides before you know what's going on).