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The Phantom Speaks (1945)

IMDb: 5.7
1945

The spirit of an executed murderer enters the body of a physician, and forces him to do its bidding namely, murder

Black Friday (1940)

IMDb: 6.3
1940

Dr Sovac transplants the brain of a gangster into his professor friends body to save his life, but there is a side effect that causes a dangerous split personality