Right, nothing can, but it is harder to corrupt when the state isn't a handful of people with shields of bureaucracy where access to power can only be attained by the richest individuals in that society.

Communism isn't "let the state do more things" as many think. Communism is "make all of the people into the state". Cut out the middle-man, so to say. Direct democracy, peoples councils, peoples courts, all with a worldview that keeps it that way; socialism/communism. It's intention, as a movement is to not to leave political power to an external organization. To organize your workplace, neighborhood, town and city, into its own political power.