No, there is not a list per se.
I'd just ask that people use a bit of sense. If your thread is likely to come across as knocking/stereotyping a minority section of society it is likely that you will get a "Thanks, but no thanks" off the moderators.
If it's related to something that is under discussion in the news nationally then it'll probably be allowed in the News & Current Affairs section with the proviso that it is real debate.