The Informer

 depicts with brutal realism the life of an informant during the Irish Rebellion of 1922, who turns in his best friend and then sees the walls closing in on him in return.

Critic Andre Sennwald, writing in the New York Times, praised John Ford's direction: "In his hands The Informer becomes at the same time a striking psychological study of a gutter Judas and a raw impressive picture of the Dublin underworld during the Black and Tan terror." Ford and cinematographer Joseph August borrowed from German expressionism to convey the Dublin atmosphere. To this point, Ford had compiled a solid workmanlike career as he learned his craft. The Informer placed him in the top echelon of American film directors and over the next 20 years he crafted numerous other classics, from the 1939 Stagecoach through the 1962 The Man Who Shot Liberty Valance.

 was added to the National Film Registry in 2018. This marks the 11th film directed by John Ford to be named to the National Film Registry, the most of any director as of 2018.