Oh? Haven't heard of that rule.
If you happen to have some neo-Nazi bands in mind or something, it might be scoffed upon, but I don't think there's any explicit rules against mentioning them. So roll on.
Being an American-based forum, I think the .org is less touchy on extreme-right issues than, say, a European-based forum might be (since those are real issues there).
On the subject, I remember hearing some Ukranian metal band that was all like "Death to Moscow! Death to the Jews!" that didn't sit too well with me
On the other hand, in a weird way I love authentic WWII Nazi propaganda music. In a morbid-curiosity and novelty-value kind of way, of course, not seriously...