Pope Pius XI
Quadragesimo Anno §4
Quadragesimo Anno: On Reconstruction of the Social Order
4 Quite agreeable, of course, was this state of things to those who thought it in their abundant riches the result of inevitable economic laws and accordingly, as if it were for charity to veil the violation of justice which lawmakers not only tolerated but at times sanctioned, wanted the whole care of supporting the poor committed to charity alone. The workers, on the other hand, crushed by their hard lot, were barely enduring it and were refusing longer to bend their necks beneath so galling a yoke; and some of them, carried away by the heat of evil counsel, were seeking the overturn of everything, while others, whom Christian training restrained from such evil designs, stood firm in the judgment that much in this had to be wholly and speedily changed.
Source: Quadragesimo Anno (Vatican.va)