Pope Pius XI
Quadragesimo Anno §3
Quadragesimo Anno: On Reconstruction of the Social Order
3 For toward the close of the nineteenth century, the new kind of economic life that had arisen and the new developments of industry had gone to the point in most countries that human society was clearly becoming divided more and more into two classes. One class, very small in number, was enjoying almost all the advantages which modern inventions so abundantly provided; the other, embracing the huge multitude of working people, oppressed by wretched poverty, was vainly seeking escape from the straits wherein it stood.
Source: Quadragesimo Anno (Vatican.va)