Pope Pius XI
Quadragesimo Anno §107
Quadragesimo Anno: On Reconstruction of the Social Order
107 This concentration of power and might, the characteristic mark, as it were, of contemporary economic life, is the fruit that the unlimited freedom of struggle among competitors has of its own nature produced, and which lets only the strongest survive; and this is often the same as saying, those who fight the most violently, those who give least heed to their conscience.
Source: Quadragesimo Anno (Vatican.va)