Poland was not part of the Soviet Union.
Eastern Poland was annexed into the Soviet Union. I would have to research to know the exact way Polish boundaries were rearranged, but I'm cooking a turkey. Between taking land and occupation of the rest, that would be enough to say "Poland was part of the Soviet Union", unless you want to have a pissing match over semantics.
ETA: Not to mention Polands government was an extension of the Kremlin for decades after.
Last edited: