April Constitution of Poland in the context of "Sanation"

The Small Constitution of 1947 (Polish: Mała Konstytucja z 1947) was a temporary constitution issued by the communist-dominated Sejm (Polish parliament) on 19 February 1947. It confirmed the practice of separation of powers and strengthened the Sejm. It was renewed in 1949, 1950, and 1951. It recognized some articles of the March Constitution of Poland (1921) and the PKWN Manifesto (1944), whereas the April Constitution of 1935 was not recognized. The Small Constitution was replaced in 1952 by the Constitution of the Polish People's Republic.

The Constitution of the Polish People's Republic (also known as the July Constitution or the Constitution of 1952) was a communist state constitution that acted as the supreme law. It passed in communist-ruled Poland on 22 July 1952. It superseded the post-World War II provisional Small Constitution of 1947, which in turn replaced the pre-war April Constitution of 1935.

The 1952 constitution introduced a new name for the Polish state, the Polish People's Republic (Polska Rzeczpospolita Ludowa, PRL), replacing the previously used Republic of Poland (Rzeczpospolita Polska). The communist-led Sejm (legislature) was declared to be the highest state authority. The real source of supreme state power, the Polish United Workers' Party (PZPR), was not regulated by the constitution; it was ruled by its own statute. The constitution legalized many practices that had been introduced in Poland, in the wake of the Soviet Red Army and the Polish People's Army defeat of Nazi Germany in 1944–1945, by Polish-communist governmental bodies, including the Polish Committee of National Liberation (PKWN) and its successors.

Krajowa Rada Narodowa in Polish (translated as State National Council or Homeland National Council, abbreviated to KRN) was a parliament-like political body created during the later stages of World War II in German-occupied Warsaw, Poland. It was intended as a communist-controlled center of authority, challenging organs of the Polish Underground State. The existence of the KRN was later accepted by the Soviet Union and the council became to a large extent subjugated and controlled by the Soviets.

The KRN was established on the night of 31 December 1943 on the initiative of the Polish communist party, the Polish Workers' Party (PPR), then led by Władysław Gomułka. It was the implementation of the party's Central Committee decision of 7 November 1943. The council was declared to be the "actual political representation of the Polish nation, empowered to act on behalf of the nation and manage its affairs until the time of Poland's liberation from the occupation". From the beginning, the KRN viewed the prewar Sanation government and the contemporary Polish government in exile as illegitimate, based on the "elitist-totalitarian" April Constitution, "whose legality had never been recognized by the nation", and as representative of narrow reactionary interests. The new government formation would be based on the "worker-peasant alliance" and on the alliance with the Soviet Union. The Armia Ludowa was established as the KRN's armed force. The exile government and the Polish Underground State, especially the Armia Krajowa command, were worried by this development and by the progressing social radicalization in Poland by Soviet strings. They accelerated the formation of the already planned Council of National Unity (Rada Jedności Narodowej, RJN), their own parliament, created on 9 January 1944.