Catholic social activism in the United States

Catholic social activism in the United States is the practical application of the notions of Catholic social teaching into American public life. Its roots can be traced to the 19th century encyclical Rerum novarum of Pope Leo XIII. == Labor union movement == The Catholic Church exercised a prominent role in shaping America's labor movement.

Source: Wikipedia — Catholic social activism in the United States (CC BY-SA 4.0)