It gets worse. After executing those poor Poles, Stalin rounded up their families and close relatives ( said to be well over 60,000) and transported them to Siberia and Kazakhstan where they had, for the most part, to live in dugouts.Yes , what a slug Stalin was , on a par with Hitler but 'on our side.' Just as big a war criminal as Snicklegruber.
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Churchill and Roosevelt read a report by Sir Owen O'malley, a British civil servant who laid the blame for the massacre at the feet of The Russians after the mass grave was discovered by the Germans. However, the report was suppressed by both not wanting to antagonise a potential ally. When the Russians recovered the ground lost to the Germans, they disinterred the corpses and planted documents with falsified dates so as to incriminate the Germans. Also, witnesses who originally blames the Russians suddenly decided the Germans were the culprits.