The Polish Question was a very ugly, messy bit of the war and the peace that followed. Somewhat similar to Yugoslavia, there were divisions within the Polish Resistance organizations between those supporting the government-in-exile in London, and the pro-Soviet faction. One reason that the Red Army sat on its hands during the Warsaw Uprising was that the Polish forces involved were primarily drawn from the London-leaning Home Army. In other cases, members of the Home Army were offered the "choice" of joining the Red Army or being sent to labor camps.

One interesting what-if? to consider is what might have happened had Roosevelt lived to see the end of the war, and the various treaties and conference (notably the Potsdam Conference), instead of the inexperienced Truman.

One of the better treatments of the final days of WW2, and the tensions between the western Allies and the Soviets over Poland is http://www.amazon.com/The-Last-100-Days-Controversial/dp/081...