History of Poland
The Polish People's Republic ("Polska Rzeczpospolita Ludowa") was established under the rule of the communist Polish United Workers' Party (PZPR). The name change from the Polish Republic was not officially adopted, however, until the proclamation of the Constitution of the Polish People's Republic in 1952.
History of Poland (1939–1945)
The State National Council (KRN), chaired by Bolesław Bierut, was established in Warsaw by the Polish Workers' Party (PPR) on January 1, 1944. The Armia Ludowa was its army. The Polish communist centers in Warsaw and in Moscow initially operated separately and had different visions of cooperation with the Soviet Union and regarding other issues. In the spring of 1944, the KRN sent a delegation to the Soviet Union, where it gained Stalin's recognition and the two branches began working together. In intense negotiations, the two Polish communist groups agreed to establish the Polish Committee of National Liberation (PKWN), a sort of temporary government.