Night and Fog (1955)
a film by Alain Resnais
Nacht und Nebel: was a directive of Adolf Hitler on 7 December 1941 signed and implemented by Armed Forces High Command Chief Wilhelm Keitel, resulting in the forced disappearance of many political activists and resistance 'helpers' throughout Nazi Germany's occupied territories, principally in Western Europe. Anyone guilty of endangering the "security or state of readiness" of German forces and who was not to be summarily executed simply vanished into the "night and fog" of Germany.