I like some Guttermouth, I saw them summer of 2012, they're actually really nice guys. They gave me a free shirt and took pictures with me. When I was talking to Mark, I mentioned I was a left-wing anarchist and he was cool about it and told me that his lyrics are just offensive for the sake of offensiveness. Anal Cunt is just horrible, they're kind of funny if your in high school but they're not musically talented in the slightest. To sum things up I have a soft spot for Guttermouth and Anal Cunt isn't really music, it's just noise.
The most "extreme" noise band I've heard is Attack SS from japan, they've got this "white noise" guitar sound.
Guttermouth, Agnostic Front, and Fear are the only real "right-wing" bands I listen to. Well I have occasionally listened to Anal Cunt and GG Allin also. Other than that I dont listen to any right-wing bands.