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In a final report released in 1952, the committee declared there was no doubt of Soviet guilt, and called the massacre “one of the most barbarous international crimes in world history.” It found that Roosevelt’s administration suppressed public knowledge of the crime, but said it was out of military necessity. It also recommended the government bring charges against the Soviets at an international tribunal – something never acted upon.

Despite the committee’s strong conclusions, the White House maintained its silence on Katyn for decades, showing an unwillingness to focus on an issue that would have added to political tensions with the Soviets during the Cold War.

It was May 1943 in the Katyn forest, a part of Russia the Germans had seized from the Soviets in 1941. A group of American and British POWs were taken against their will by their German captors to witness a horrifying scene at a clearing surrounded by pine trees: mass graves tightly packed with thousands of partly mummified corpses in well-tailored Polish officers uniforms.

The Americans – Capt. Donald B. Stewart and Lt. Col. John H. Van Vliet Jr. – hated the Nazis and didn’t want to believe the Germans. They had seen German cruelty up close, and the Soviets, after all, were their ally. The Germans were hoping to use the POWs for propaganda, and to drive a wedge between the Soviet Union and its Western Allies.

But returning to their POW camps, the Americans carried a conviction that they had just witnessed overwhelming proof of Soviet guilt. The corpses’ advanced state of decay told them the killings took place much earlier in the war, when the Soviets still controlled the area. They also saw Polish letters, diaries, identification tags, news clippings and other objects – none dated later than spring of 1940 – pulled from the graves. The evidence that did the most to convince them was the good state of the men’s boots and clothing: That told them the men had not lived long after being captured.