Pope Pius XI
Quadragesimo Anno §76
Quadragesimo Anno: On Reconstruction of the Social Order
76 What We have thus far stated regarding an equitable distribution of property and regarding just wages concerns individual persons and only indirectly touches social order, to the restoration of which according to the principles of sound philosophy and to its perfection according to the sublime precepts of the law of the Gospel, Our Predecessor, Leo XIII, devoted all his thought and care.
Source: Quadragesimo Anno (Vatican.va)