The Street of Sin (1928)

"Basher Bill," a retired prizefighter turned criminal, pretends to reform by joining a Salvation Army shelter in London run by a pious wraith named Elizabeth. Attracted to Elizabeth (although he is engaged to a street girl named Annie), Bill confesses to a bank robbery, has a spiritual revelation, and decides to go straight. His cast-off sweetheart reports him to the police; then, contrite, she warns Bill of the impending danger. Bill is captured immediately, but he escapes and sacrifices his life to save Elizabeth and the Salvation Army nursery when the rest of the gang use them as a human barricade against the police.