 The association of Catholic Clergy Pacem in Terris was a regime-sponsored organisation of Catholic clergy in the communist Czechoslovakia between 1971 and 1989.Its name was taken from the well-known encyclical "Pacem in terris" of Pope John XXIII.SKD PiT was registered on August 1, 1971 and its stated purposes were 'peace in the world' and 'friendship between nations'.