This leftist-Muslim partnership exists not just on the streets, but in the protest movement’s heart. Britain’s Stop the War coalition, which has organised more than 15 nationwide protests and hundreds of smaller events, was largely forged by two small, intensely committed bodies—the far-left Socialist Workers Party (SWP) and the Muslim Association of Britain, which is close to the international Muslim Brotherhood. These tiny groups have co-ordinated street protests by up to 1m people.
http://www.economist.com/world/international/displaystory.cfm?story_id=8675234