In this Mentor-Omega volume, Anne Fremantle has gathered together the central social teachings of the Popes, from Leo XIII to John XXIII. These documents offer the reader a concrete and coherent statement of Catholic social doctrine. In them will be found a program for social justice at once unchanging yet growing ever more dynamic, reaching its climax in the world-acclamed encyclical of Pope John - Pacem in Terris, peace on earth.