12 What would be the condition of a human society based on such materialistic tenets? It would be a collectivity with no other hierarchy than that of the economic system. It would have only one mission: the production of material things by means of collective labor, so that the goods of this world might be enjoyed in a paradise where each would "give according to his powers" and would "receive according to his needs." Communism recognizes in the collectivity the right, or rather, unlimited discretion, to draft individuals for the labor of the collectivity with no regard for their personal welfare; so that even violence could be legitimately exercised to dragoon the recalcitrant against their wills. In the Communistic commonwealth morality and law would be nothing but a derivation of the existing economic order, purely earthly in origin and unstable in character. In a word. the Communists claim to inaugurate a new era and a new civilization which is the result of blind evolutionary forces culminating in a humanity without God.
Source: Divini Redemptoris (Vatican.va)