Pope John XXIII
Mater et Magistra §68
Mater et Magistra: On Christianity and Social Progress
68 We are filled with an overwhelming sadness when We contemplate the sorry spectacle of millions of workers in many lands and entire continents condemned through the inadequcy of their wages to live with their families in utterly sub-human conditions. This is probably due to the fact that the process of industrialization in these countries is only in its initial stages, or is still not sufficiently developed.
Source: Mater et Magistra (Vatican.va)