Anarchism is the political system in which society works through the voluntary cooperation of individuals. Such a society would work without the coercive authority of government, religion, or corporations.
Did you know there's an anarchist labor union? It's called the Industrial Workers of the World, or IWW, or the Wobblies.
Workers Solidarity Alliance (WSA) is an anarcho-syndicalist organization, the U.S. group belonging to the International Workers Association (IWA).
THE SHADOW is an anarchist newspaper in New York City that has information on squating, police abuse of power, corruption in politics, and landlord-tenant struggles, among other things.
AK Press publishes and distributes anarchist books in the U.S. and the U.K. Lots of titles.