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Island of Doomed Men (1940)

IMDb: 5.9
1940

Undercover agent Mark Sheldon gets paroled to a remote tropical island with a diamond mine manned by slave labor run by sadistic Stephen Danel

The Man They Could Not Hang (1939)

IMDb: 6.9
1939

When Dr Savaards experiment in cryonics is interrupted by the short sighted authorities, his volunteer dies, and he is condemned to death He vows vengeance if he can survive his own hanging