52 Apropos of this, We might cite Our words to the College of Cardinals and the Bishops at Christmas time, 1942: "The Church has condemned the various forms of Marxist Socialism; and she condemns them again today, because it is her permanent right and duty to safeguard men from fallacious arguments and subversive influence that jeopardize their eternal salvation. But the Church cannot ignore or overlook the fact that the worker, in his efforts to better his lot, is opposed by a machinery which is not only not in accordance with nature, but is at variance with God's plan and with the purpose He had in creating the goods of the earth. In spite of the fact that the ways they followed are false and to be condemned, what Christian, and especially what priest, could remain deaf to the heartfelt cries that call for justice and a spirit of brotherly collaboration in a world made by a just God? Such silence would be culpable and unjustifiable before God, and contrary to the inspired teaching of the Apostle, who, while he inculcates the need of resolution in the fight against error, also knows that we must be full of sympathy for those who err, and give due consideration to their arguments, encourage and help them. . . The dignity of the human person then, speaking generally, requires as a natural foundation of life the right to the use of the goods of the earth. To this right corresponds the fundamental obligation to grant private ownership of property, if possible, to all. Positive legislation, regulating private ownership may change and more or less restrict its use. But if legislation is to play its part in the pacification of the community, it must see to it that the worker, who is or will be the father of a family, is not condemned to an economic dependence and servitude which is irreconcilable with his rights as a person.
Source: Evangelii Praecones (Vatican.va)