After WW2, Poland received a significant part of Eastern Germany. How was the resettling of that area handled by the Polish government? My impression of the sequence of events following the war is as follows:
Now there are a lot of unclear points I'd like to see answerered:
The transfer of these areas to Poland has been decided in Yalta conference, however, some places like Wroclaw/Breslau did not capitulate until May 1945. There was still significant German presence in these areas even when new settlers from the East started to come. Some locals, like priests, municipal "technicians" (people who serviced local water locks or burned trash) were allowed to stay until new settlers arrived.
Initially the Regained Territories were under control of the Berling's army, but late in November 1945 a Ministry for the Regained Territories was created to organize the resettling effort. They determined the 'civic' leadership of the area. (in the communist countries the real power was held by the Party, who nominated members of the local councils/soviets, even though city governments (mayors etc.) also existed). This was a complex process, people received special document to be resettled, but often for ideological reasons people from large cities were resettled to different towns, often dividing families and friendships.
The prioritzed ones were often people released from work camps - that is, they were resettled in the first place, but no one could "pick" houses.