During World War II, United States Army Signal Corps units played a key role in documenting combat missions. Noted Hollywood producers, directors, and photographers (such as Darryl Zanuck, Frank Capra, John Huston, and George Stevens) all served in the Signal Corps during the war. In 1943, General Dwight D. Eisenhower charged American filmmaker Stevens with directing teams filming the advance of U.S. forces, eventually including the liberation of the concentration camps.
On November 29, 1945, only a week into the trial, the IMT prosecution introduced an hour-long film titled "The Nazi Concentration Camps." When the lights came up in the Palace of Justice all assembled sat in silence. The human impact of this visual evidence was a turning point in the Nuremberg trial. It brought the Holocaust into the courtroom.