A 50-block stretch of Los Angeles has become one of the most notorious child sex trafficking corridors in the U.S. Our reporter Emily Baumgaertner Nunn rode along with undercover officers trying to rescue the girls and arrest the traffickers. Video by Emily Baumgaertner Nunn, Christina Shaman, Kassie Bracken, Stephanie Swart, June Kim and Christopher Orr/The New York Times #losangeles #figueroastreet