Following the Soviet takeover, the PAX Association had been formed with the intention to undermine grass-roots support for the Roman Catholic Church in Stalinist Poland.
Created by Bolesław Piasecki, it approved the trial and imprisonment of many Polish clergymen, among them Bishop Czesław Kaczmarek and Cardinal Stefan Wyszyński.
PAX attempted to compete with the conservative clergy of the interwar era over public policy issues, especially after the arrest of hundreds of priests by the state security in early 1950s.
According to Norman Davies PAX was an NKVD front organisation, set up to win over Polish Catholics to communism, and to break their links to the Vatican.
Throughout the decades after its creation and the death of Stalin, it continued to steadily lose power and influence, although it still exists in modern Poland.