I am going to tell the school about an untrustworthy club.
What is it about the club you don't like?
I'm afraid they will interfere with my games.
If you feel the club is intentionally trying to interfere with what you're doing and you should bring it up to someone at the school.
I just don't want them to think I'm spreading false information about them.
It is fine to not like something as long as you have a valid reason. Just do not let this feeling get in the way of judging them fairly and unbiased when it comes to their opinions about things.