I don't know where all those people came from last time, but it looks like they came back, and I want to know who invited them, because I set this group to invite-only.

I don't mean to say that this is an exclusive club or anything but I'd prefer if we could keep it to people we know. No one is in any trouble but it is somewhat annoying to have to kick 20+ people from the group because I don't know where they came from and they're never in chat.