"Drawing on that party's tight organization, ANSWER attracted an estimated 20,000 people to their first major action, an "Anti-War, Anti-Racist" rally and march in Washington, D.C., primarily in protest of the then impending invasion of Afghanistan. This rally occurred on September 29, 2001, a mere 18 days after the September 11 attacks. This rally happened several hours after the first national protest against the war, an unpermitted march of 2,000 through the streets of Washington which had been organized by the Anti-Capitalist Convergence. The International Action Center is an activist group founded by former United States attorney general Ramsey Clark, with the goal of coordinating activism and information opposing domestic and international injustices.
http://www.nationmaster.com/encyclopedia/Post_September-11-anti_war-movement
Anti-war rallies in Washington, New York
http://archives.cnn.com/2001/US/09/29/ret.antiwar.protests/
September 29, 2001
Chanting "no war, no war," protesters marched with banners calling for the United States to "Destroy imperialism, not Afghanistan."
"When someone in the United States commits an atrocious crime as in an act of murder, we don't go after their families or their community or their neighborhood," one demonstrator said. "We go in and we arrest the individuals involved, and I think that's what needs to be done here."
"War is not the answer, Islam is not the problem," they chanted as they walked.