Communism is a system in which man exploits man. Under capitalism, it's just the opposite.
Communism is a higher social form, whose fundamental principle is the full and free development of every individual.
Communism is a form of society which is beyond justice simpliciter, not simply beyond distributive justice.
Communism is a not a dictatorship, but a form of humanism, it is the 'advent of practical humanism'.
Communism is a mode of production that takes as its aim the turning of the proletariat into a class.
Communism is a religion in that, though it has no God, it has prophets, revealed scriptures, a body of infallible doctrine, heresies, saints, martyrs, and shrines.
Communism is all political truth (not just to a subset of political events) because all political truths, insofar as they count as 'truths' are necessarily universalizing, equalitarian, and emancipatory.