Tuy Sobil, who goes by the street name K.K., joined the Crips in Long Beach, Calif., when he was 13, started smoking crack, and was in jail for armed robbery by the time he was 18. After serving two years in Taft Prison in California and another three years in an immigration detention facility, the U.S. deported him to Cambodia in 2004 — even though he had never set foot in the country, couldn’t speak the local language, and had a son back in California. “When I first came here at first I was scared,” K.K. said. “You’re always…