The Prisoner of Shark Island

The Prisoner of Shark Island is a 1936 film loosely based on the life of Samuel Mudd, produced by Darryl F. Zanuck, directed by John Ford, and starring Warner Baxter and Gloria Stuart.

After a period of ill treatment due to his notoriety, his skills as a doctor are requested by the Commandant of the prison. The island has been in the grip of a yellow fever epidemic and the official prison doctor has fallen ill. Dr. Mudd takes charge with the blessing of the Commandant and the cooperation of the soldier guards, and the yellow jack epidemic subsides.The film portrays Dr. Mudd as an entirely innocent victim and scapegoat, while the actual historical details of the case and his ties to Booth cast a shadow on his true innocence. ........

Source: Wikipedia