The US military in fact defended Stalin's military in resettling Germans who were pushed by Nazi Germany to settle Eastern Europe - of course the initial settlement wasn't legitimate either, but somewhere between half a million and two million Germans died in the resettlement. https://en.wikipedia.org/wiki/Flight_and_expulsion_of_German...

Also, as part of war reparations, millions of Germans were placed in forced labor by agreement of Stalin, Churchill, and Roosevelt: https://en.wikipedia.org/wiki/Forced_labor_of_Germans_after_...