I'm genuinely curious, how could communism be applied to millions of people without any central authority to oversee the system? Say, the sewer need to be maintained, and the people assigned to the work by the community decided "nah, I don't want to clean the sewer" and not show up to work, what would the community do? What if the people assigned to mining coals decided they don't want to mine coal anymore because it's a horrible job and no one volunteer to replace them? Will the community force them to work or face punishment? If so, who make the decision if not a central authority?