The Man They Could Not Hang (1939)

"TRANSFORMED BY THE HANGMAN'S NOOSE... from a doctor serving humanity, into a demon filled with hate and terrorizing blood-lust!"

Dr. Henryk Savaard is a scientist working on experiments to restore life to the dead. When he is unjustly hanged for murder, he is brought back to life by his trusted assistant. Re-animated he turns decidedly nasty and sets about murdering the jury that convicted him.