I don't know about that, but I do know that the head of our delegation, Alger Hiss, was on Stalin's payroll for 15 years or more. He was also FDR's chief advisor at the Yalta conference feeding the Soviet's all of the Allied negotiating positions. His actions lead to millions being enslaved under Stalin. The Washington establishment including people like Acheson had to defend him and others because to publicly admit what they knew to be true would incriminate themselves as either fools or incompetents and tarnish FDRs administration as one of gross mismanagement. For their own careers, they could not allow that to happen. Instead, Hiss and others were quietly let go from government service and those who asked questions like McCarthy were attacked.