Hand was relieved when the United States entered the war in December 1941. He felt free to participate in organizations and initiatives connected with the war effort, and was particularly committed to programs in support of Greece and Russia. He backed Roosevelt for the 1944 election, partly because he feared a return to isolationism and the prolonging of the wartime erosion of civil liberties. In 1943, the House Un-American Activities Committee or "Dies Committee", for example, had aroused his fears with an investigation into "subversive activities" by government workers. Hand's contemporary at Harvard College, Robert Morss Lovett, was one of those accused, and Hand spoke out on his behalf. As the end of the war approached, there was much talk of international peace organizations and courts to prevent future conflict, but Hand was skeptical. He also condemned the Nuremberg war-crimes trials, which he saw as motivated by vengeance; he did not believe that "aggressive war" could be construed as a crime. "The difference between vengeance and justice," he wrote later, "is that justice must apply to all."