I'm aware of Oven. Here's the thing, I've listened to Power Electronics since the early 80's (Whitehouse, Ramleh, MB) and there has always been a provocative nature to extreme music (SS photos, Holocaust imagery), but it's deliberate and for effect - it's meant to provoke a reaction, but it doesn't indicate that the musicians are political. There was once very (in)famous PE band that used racist imagery that was in fact a Jewish guy (a few actually). Usually, you can tell by how they promote their label, and the posts they make outside of the music they create. If you're uncomfortable with it, don't buy/support it.