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 so-called Provisional Government of the Republic of Poland was established at the end of 1944 in Lublin and was recognized by the Soviet Union, Czechoslovakia and Yugoslavia. It was headed by the socialist Osóbka-Morawski, but the communists held a majority of key posts. In April 1945, the provisional government signed a mutual friendship, alliance and cooperation pact with the Soviet Union.