The spanish revolution was a very organized affair and there was deep coalition between labor, anarchists, socialists, etc. Much of the industries and institutions were collectivized creating a veritable socialist state. Millions were killed in this struggle.
The more modern anarchist movement in Greece, going back to the early 1970's, is quite different. It is much more loosely organized and has never had a goal of instituting a different form of economy or governance. Mostly all actions have begun with small groups and then larger, chaotic actions are spurred in which, altogether since the 70's, have resulted in a death toll in the hundreds.
I don't know how anarchists in Greece feel today, but here I do not feel very aligned with labor unions, communists or even anti-war groups. The character of anarchism in the spanish revolution was quite different than that of it today.