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

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.

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.