Over a Gizmodo, Kim Kelly—a journalist with deep knowledge of heavy metal—wrote a terrific guide on how to figure out if the metal band you've just discovered has any Nazis in it.
The tl;dr is that it takes quite a bit of work to orient yourself well in the semoitics of metal Nazis, but once you've spent a bit of time acclimatizing yourself to the main signals, you develop a spider-sense for it. — Read the rest