Ping.
“In 1952, about nine years later, a special Congressional committee, headed by Congressman Ray J. Madden of Indiana, endeavored to discover the full facts. Among the witnesses called were Arthur Bliss Lane, former Ambassador to Poland; George H. Earle, former Minister to Bulgaria and Turkey; Lt. Col. John H. Van Vliet, Jr., and Polish ex-Premier Stanislaw Mikolajczyk. Col. Van Vliet, a former prisoner of the Germans, had personally witnessed the exhuming of the bodies in one of the Katyn graves, and had later reported on it in full to the War Department. This report had been labeled ‘Top Secret.’ Then it ‘disappeared.’ The Congressional committee was unable to obtain it. Earle had reported similar facts disclosed by a Bulgarian witness and had been told by Mr. Roosevelt not to publish them as this might offend the Russians.
The Congressional committee interviewed 81 witnesses, took 300 depositions and statements and received 183 exhibits. Its unanimous report declared that:
‘The Soviet NKVD committed the massacre of thousands of Polish Army officers in the Katyn forest near Smolensk, Russia, not later than the spring of 1940.’ …”
Freedom Betrayed: Herbert Hoover’s Secret History of the Second World War and Its Aftermath, edited with an Introduction by George H. Nash, Hoover Institution Press Publication No. 598, Stanford University, Stanford, CA, 2011, page 619, fn 12.
Remember also that the USSR and Poland had their own war in 1920. The Poles won. Stalin never forgot! [See: Warsaw 1920: Lenin's Failed Conquest of Europe, Adam Zamoyski.]