A clarification:
Communism is a society where each gives according to their ability and takes according to their needs, with no state, hierarchy or practice of usury.
Socialists wants a transitional phase known (Socialism) where a state under the dictatorship of the proletariat eradicates Capitalism.
Anarchists want to cease participation in Capitalism immediately, and practice Communism today - this is what is called "direct action".
In short, Anarchism is acting as if you are already free.