This article is a partnership between Reveal and 404 Media. Jesus Gutiérrez, 23, was walking home one morning from a Chicago gym when he noticed a gray Cadillac SUV with no license plates. He kept walking, shrugging it off. Then the car pulled over and two men got out. The federal immigration officials told him not to run. They then peppered Gutiérrez with questions: Where are you going? Where are...