A temporary government , declared as the Polish Committee of National Liberation , was established by Polish communists and allied politicians in July 1944 in Lublin , when Poland was being liberated from the Nazi German occupation by the Soviet and Polish armies . The communists were pressured by the United States and Britain , as discussed by their leaders with Joseph Stalin at the Yalta Conference , to admit into the Polish government participants of the democratic opposition , including members of the London-based Polish government-in-exile
Yalta Conference
Yalta Conference
Polish People's Party (1945–49)