The Court's reasoning adds up to this: The Commission must be sustained because of its accumulated experience in solving a problem with which it had … - Robert H. Jackson

The plans of Adolf Hitler for aggression were just as secret as Mein Kampf, of which over six million copies were published in Germany. He not only openly advocated overthrowing the Treaty of Versailles, but made demands which went far beyond a mere rectification of its alleged injustices (GB-128). He avowed an intention to attack neighboring states and seize their lands, which he said would have to be won with "the power of a triumphant sword." Here, for every German to hearken to, were the "ancestral voices prophesying war."

The duty to disclose knowledge of crime rests upon all citizens.

If certain acts of violation of treaties are crimes, they are crimes whether the United States does them or whether Germany does them, and we are not prepared to lay down a rule of criminal conduct against others which we would not be willing to have invoked against us.