The Sin of Madelon Claudet (1931)

French country girl Madelon falls for artist Larry, who leaves her after she becomes pregant. She finds help from jewel thief Carlo, but he commits sucide when the police try to arrest him. Madelon is arrested and receives a ten year term in prison for assisting him in his profession. To support her son, who does not know she's in person, she becomes a street walker, allowing him to attend medical school.