House by house, Edna Burgette knocked on doors last fall in her Scranton neighborhood, asking whomever answered whether the 17-year-old Colombian boy at her side could stay with them for the school year. "Take him. He is a good boy. He speaks English," Mrs. Burgette said. People closed their doors in his face. The boy then spent several months in a home with an 80-year-old man, where he was not allowed to eat food in the refrigerator, and where he lost too much weight. The scenario, written in a complaint to the U.S. Department of State by his mother, Nemesia...