Polish People's Republic
The Polish People's Republic (, ) was a state in Central Europe that existed from 1947 to 1989, and the predecessor of the modern democratic Republic of Poland. With a population of approximately 37.9 million inhabitants near the end of its existence, it was the most populous state of the Eastern Bloc after the Soviet Union. Having a unitary Marxist–Leninist communist government, it was also one of the main signatories of the Warsaw Pact. The official capital since 1947 and largest city was Warsaw, followed by industrial Łódź and cultural Kraków.
Polish United Workers' Party
The Polish United Workers' Party was established at the unification congress of the Polish Workers' Party (PPR) and Polish Socialist Party (PPS) during meetings held from 15 to 21 December 1948. The unification was possible because the PPS activists who opposed unification (or rather absorption into the Workers' Party) had been forced out of the party. Similarly, the members of the PPR who were accused of "rightist – nationalistic deviation" were expelled. Thus, for all intents and purposes, the PUWP was the PPR under a new name.