1970s. In the early 1950s, the Stalinist regime also carried out major changes to the education system. The program of free and compulsory school education for all and the establishment of free institutions of higher learning received much support. The communists screened out what facts and interpretations were to be taught; history and other sciences had to follow Marxist views approved by ideological censorship. During 1951–53, a large number of prewar professors who were perceived by the regime as reactionary was dismissed from universities. Government control over art and artists deepened. The Soviet-style socialist realism became the only formula accepted by the authorities after 1949. Most works of art and literature represented propaganda of the party or had to be in line with its views. (See also: Socialist realism in Poland) The reforms often brought relief for a significant part of the population. After World War II many people were willing to accept communist rule in exchange for the restoration of relatively normal life; hundreds of thousands joined the communist party and actively supported the regime. Nonetheless, latent popular discontent remained present and many Poles adopted the attitude of "resigned cooperation". Others, like the Freedom and Independence organization that originated from elements of the Home Army and especially the National Armed Forces actively opposed the communists, hoping for a World War III that would liberate Poland. Most people who took up arms against the communist regime had surrendered during the amnesties of 1945 and 1947, but brutal repressions by the secret police continued and some fought well into the 1950s. The communists further alienated many Poles by persecuting the Catholic Church. The PAX Association created in 1947 and led by the former prewar far-right activist Bolesław Piasecki, attempted to divide the Catholic movement and promote a communist rule-friendly, collaborationist church. The PAX did not get very far in molding the Catholic public opinion, but published numerous books and officially approved daily Catholic press. In 1953 Cardinal Stefan Wyszyński, the Primate of Poland, was placed under house arrest, even though he had been willing to make compromises with the government. In the early 1950s, the war against religion by the secret police led to arrests and persecution of hundreds of religious personalities, culminating in the Stalinist show trial of the Kraków Curia. (See also: Polish anti-religious campaign) The constitution of 1952 guaranteed on paper all sorts of democratic rights and freedoms.