In the early days of communism, the Leninists actually believed anarchy as a basic tenant of communism. The belief was the workers would know what to do and produce. The communists believed managers were an extension of the bourgeois to control workers. After years of commune and factory failures, Stalin introduced a loyal highly paid elite to get farms and factories working. So much for anarchy as the basis of communism. Practical communism does not rely on anarchy. The anarchists apparently don't read beyond Marx.
Marx was too organized for the anarchists.