If you think about it, Communism is really nothing more or less than a means of returning monarchy to the world, but under a technocratic rather than a theocratic basis.
You have a ruler, you have an aristocracy, and you have a priesthood, all of whom rule absolutely over serfs who have no say and no rights. As in, say, medieval Europe the priesthood is limited in what it can say and do–and heresy is still punished–but it serves the role of supporting the rulers and validating them in their claims to power.
Small wonder it is so attractive to our aspiring rulers.