Here are some sources that call PETA "extremist": Fox News (and again), the [
http://www.findarticles.com/p/articles/mi_m1282/is_24_55/ai_n13606711 National Review], a Welsh local paper, and the Competitive Enterprise Institute.  Those are just the mainstream media outlets and one organization with the same claim to fame as PETA.  Of course, we can add www.petakillsanimals.com and www.peta-sucks.com, but that might cause an argument -)