Jack Duane is a smooth-talking criminal that Jurgis befriends during his first jail sentence. When Jurgis returns to jail, Duane convinces him to join his life of crime. Later on, Duane is caught breaking a safe, and manages to pull strings to arrange a release from prison. However, the public is so outraged that Duane's allies decide to sacrifice him to curry favor, and he is forced to leave town. Duane's misfortune shows how easily Chicago's system of graft can turn on its own, and foreshadows Jurgis's similar fall out of favor in the criminal underworld later in the novel.