Robert Mitchum was initially known for his work in film noir. His first foray into the genre was a supporting role in the 1944 B-movie When Strangers Marry, about newlyweds and a New York City serial killer. Undercurrent, another of Mitchum's early noir films, featured him playing against type as a troubled, sensitive man entangled in the affairs of his brother (Robert Taylor) and his brother's suspicious wife (Katharine Hepburn).
John Brahm's The Locket (1946) featured Mitchum as bitter ex-boyfriend to Laraine Day's femme fatale. Raoul Walsh's Pursued (1947) combined Western and noir styles, with Mitchum's character attempting to recall his past and find those responsible for killing his family. Crossfire (also 1947) featured Mitchum as a member of a group of World War II soldiers, one of whom kills a Jewish man. It featured themes of anti-Semitism and the failings of military training. The film, directed by Edward Dmytryk, earned five Academy Award nominations.