(The Independent) The British Army Film Unit cameramen who shot the liberation of Bergen-Belsen concentration camp in 1945 used to joke about the reaction of Alfred Hitchcock to the horrific footage they filmed. When Hitchcock first saw the footage, the legendary British director was reportedly so traumatized that he stayed away from Pinewood Studios for a week. Hitchcock may have been the king of horror movies but he was utterly appalled by "the real thing".
In 1945, Hitchcock had been enlisted by his friend and patron Sidney Bernstein to help with a documentary on German wartime atrocities, based on the footage of the camps shot by British and Soviet film units. In the event, that documentary was never seen.