Night and Fog (French: Nuit et brouillard) is a 1955 French documentary short film. Directed by Alain Resnais, it was made ten years after the liberation of Nazi concentration camps. The documentary features the abandoned grounds of Auschwitz and Majdanek while describing the lives of prisoners in the camps. Night and Fog was made in collaboration with scriptwriter Jean Cayrol, a survivor of the Mauthausen-Gusen concentration camp. The music of the soundtrack was composed by Hanns Eisler.
Source : Wikipedia.