Falsely accused man of a bank robbery gets revenge on townspeople for attacking him in jail

Hi! Thanks for helping me find this movie. It’s about a man who gets falsely accused of killing a boy during a bank robbery he did not commit. The townspeople want to avenge the boy’s death by attacking the jail in which he is kept. They set fire to the jail. The man survives but gets horribly disfigured, then seeks revenge on the people who attacked him by killing them. Hope you can help me find this great thriller, and no it is not the Gerard Butler movie, it’s an old B&W film.