[Field Marshall Wilhelm Keitel, supreme chief of the German armed forces, explained the thinking behind the Nazis'] Night and Fog ... Efficient and enduring intimidation can only be achieved...by measures by which the relatives of the criminals do not know the fate of the criminals...These measures will have a deterrent effect because the prisoners will vanish without a trace and no information may be given as to their whereabouts or their fate. Johann Wolfgang von Goethe