The german artist ANC (Anti Nazi Core) makes extreme speedcore which he calls Speedfolter. He released lots of tracks on the label Hate System which stopped in 2001.
There is another ANC (AnarchistNoiseClub) anarcho-noise-break-core from France : http://www.freewebtown.com/anc/ Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.