Sidewalks of New York (1931)

A comical romance of life in New York tenement districts when Harmon (Buster Keaton), a millionaire's son, falls in love with a tenement girl, Margie (Anita Page), and tries, for her sake, to control her tough young brother. He funds a gymnasium and tries to be a big brother to the youngsters of the neighborhood., followed by fast-and-furious complications. He gets in trouble when he stages a wrestling match, more so when tries to be a boxer as a good example - and then a gang leader marks him as prey, and he's dodging bullets when he isn't dodging other woes.