Blackmail is a 1939 American crime drama film directed by H. C. Potter and starring Edward G. Robinson, Ruth Hussey and Gene Lockhart.^[1]

John Ingram is a highly successful oil-field firefighter and a family man. It is a contented life, he has even bought his own oil well in hope of striking it rich. His greatest fears are realized, however, when a man, William Ramey, from his secret past sees Ingram in a newsreel and shows up looking for a job.

Ramey attempts to blackmail Ingram, who had run from a chain gang years ago, and began a new life under an assumed name. After a shady deal is made, Ingram is tricked and Ramey turns him into authorities, who return him to a chain gang. Ramey subsequently becomes a very rich man.

When Ingram finds out about the success of the man who betrayed him, he plans a daring escape in an attempt to return home and get revenge.

Ramey has successfully run Ingram's business in his absence;but only because no emergencies have arisen that would require Ingram's special knowledge.

As fate would have it, the escaped Ingram arrives at the plant just as a major oil fire breaks out.

Overpowering Ramey, Ingram slowly drags him towards the heart of the blaze; hinting that unless Ramey makes a full confession; he will do nothing to save them.

A frightened Ramey agrees. Ingram douses the oil fire, and is eventually restored to his former position of respectability.

• Edward G. Robinson as John R. Ingram, an alias of John Harrington
• Ruth Hussey as Helen Ingram
• Gene Lockhart as William Ramey
• Bobs Watson as Hank Ingram
• Guinn 'Big Boy' Williams as Moose McCarthy (as Guinn Williams)
• John Wray as Diggs
• Arthur Hohl as Rawlins
• Esther Dale as Sarah
• Frank Darien as Watchman (uncredited)
• Robert Homans as Cooper (uncredited)
• Ethan Laidlaw as Oil Worker (uncredited)
• Harry Tenbrook as Truck Driver (uncredited)

• Cool Hand Luke is a 1967 American prison drama film
• Hellfighters is a 1968 American action film starring John Wayne