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 United Workers' Party
The former activists of the PUWP established the Social Democracy of the Republic of Poland (in Polish: Socjaldemokracja Rzeczpospolitej Polskiej, SdRP), of which the main organizers were Leszek Miller and Mieczysław Rakowski. The SdRP was supposed (among other things) to take over all rights and duties of the PUWP, and help to divide out the property of the former PUWP. Up to the end of the 1980s, it had considerable incomes mainly from managed properties and from the RSW company ‘Press- Book-Traffic’, which in turn had special tax concessions. During this period, the income from membership fees constituted only 30% of the PUWP's revenues. After the dissolution of the PUWP and the establishment of the SdRP, the rest of the activists formed the Social Democratic Union of the Republic of Poland (USdRP), which changed its name to the Polish Social Democratic Union, and The 8th July Movement.