In December 1948, after the removal of Gomułka and imposition of Bierut as the communist Polish Workers' Party chief, the PPR and Cyrankiewicz's rump PPS joined ranks to form the Polish United Workers' Party (Polska Zjednoczona Partia Robotnicza, PZPR), in power for the next four decades. Poland became a de facto one-party state and a satellite state of the Soviet Union. Only two other parties were allowed to exist legally: the United People's Party (ZSL) that had split from Mikołajczyk's PSL and was meant to represent rural communities, and the Alliance of Democrats (SD), a token intelligentsia party (see also: List of political parties in Poland). As the period of Sovietization and Stalinism began, the PZPR was anything but united. The most important split among the communists occurred before the union with the PPS, when the Stalinists forced Gomułka out of the PPR's top office and suppressed his native communist faction. The PZPR became divided into several factions, which espoused different views and methods and sought different degrees of the Polish state's distinction and independence from the Soviet Union. While Marxism–Leninism, the official ideology, was new to Poland, the communist regime continued, in many psychologically and practically important ways, the precepts, methods and manners of past Polish ruling circles, including those of the Sanation, the National Democracy, and 19th century traditions of cooperation with the partitioning powers. With Poland being a member of the Soviet Bloc, the party's pursuits of power and reform were permanently hindered by the restrictions and limits imposed by the rulers of the Soviet Union, by the resentful attitude of Polish society, conscious of its lack of national independence and freedoms, and by the understanding of the party managers that their positions would terminate once they stop conforming to the requirements of the Soviet alliance (because of both the lack of public support and Soviet reaction). Poland's political history was governed by the mutual dependence of the Soviets and the Polish communists. The nomenklatura political elite developed. It comprised leaders, administrators and managers within the ruling party structure, in all branches of central and local government and in institutions of all kinds. Nomenklatura members were appointed by the party and exercised political control in all spheres of public life, for example economic development, industry management, or education. For the party, the privileged nomenklatura layer was maintained to assure the proper placement of people who were ideologically