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.
Polish Workers' Party
Under PPR rule, the Republic of Poland was a declared "people's democracy" and was not officially considered a socialist entity. Private property and free market functionality were tolerated and the role of the state was not overly exposed. All this had changed with the establishment of the PZPR: the Six-Year Plan of heavy industrial development was imposed and the building of state socialist system and society commenced in earnest.