Romance of the Underworld.

When a gangster's speakeasy is raided by the police, one of the people picked up is the gangster's pretty young girlfriend. A kind-hearted cop takes pity on her and helps her get out of that life. While waitressing to earn money for college, she meets a wealthy and handsome young man and they fall in love--but he doesn't know about her somewhat shady past and her relationship with the gangster.