They Won't Forget is a 1937 American drama film directed by Mervyn LeRoy and starring Claude Rains, Gloria Dickson, Edward Norris, and Lana Turner, in her feature debut.

It was based on a novel by Ward Greene called Death in the Deep South, which was in turn a fictionalized account of a real-life case: the trial and subsequent lynching of Leo Frank after the murder of Mary Phagan in 1913.

"[1] Writing for Night and Day in 1937, Graham Greene gave the film a good review, comparing its effect to that of Fritz Lang's Fury.

[citation needed] In the documentary film I Am Not Your Negro, James Baldwin's unpublished notes recall the impression the face of the terrified black suspect left on him.

[3] The story was also dramatized in 1987 as a four-hour television miniseries entitled The Murder of Mary Phagan, written by Larry McMurtry and starring Jack Lemmon, Kevin Spacey, Rebecca Miller, Cynthia Nixon and William H. Macy.