My only concern would be the blackmail angle. Was any pressure brought to bear on FDR to keep this quiet?
Did foreign intelligence agencies know?
That might be something. The Roosevelt administration was riddled with communists, and when Roosevelt was told that Alger Hiss was a Soviet Agent, the bearer of the message was told to “Go f**k yourself”.
Well, as history shows, Alger Hiss was in it all the way for the Soviets.