Fritz Lang's M (1931)
Above left: Advertising placard for the original German release of M. (Note that this still is not an image that appears in the film.) Right: pressbook for the film's premiere. Immediately above: the modernist title image at the beginning of the film. The title M was decided on shortly before the film's release; the original working title was Murderers among Us. As Anton Kaes points out, M is the first letter not only of Morder (murderer), but also of Mann (man), Mensch (human being), and earlier Lang films Metropolis and Dr. Mabuse the Gambler.

Lang (1890-1976; note monocle) and Thea von Harbou (1888-1954), his wife and collaborator on the screenplays for Metropolis and M. They separated shortly after M and divorced after von Harbou joined the Nazi party.
Lang with cinematographer Fritz Arno Wagner. Wagner (1889-1958) worked on several important German films of the era, including Nosferatu and The Threepenny Opera. He was cinematographer for Westfront 1918, the war movie whose poster appears briefly in M.
A look at the Berlin studio where M was filmed, a former aircraft hangar that allowed room for Lang's overhead shots.
Production drawing for the trial scene. In the film, this wide expanse is covered in a long shot tracking left to right.