German citizens are forced to view the cremation ovens in this Margaret Bourke-White photograph. Elie Wiesel, a prisoner at Buchenwald, said the Holocaust was a clear example of why it's impossible to remain on the sidelines when an evil is being committed. "I swore never to be silent whenever and wherever human beings endure suffering and humiliation," he said. "We must always take sides. Neutrality helps the oppressor, never the victim. Silence encourages the tormentor, never the tormented."