Los Angeles street gangs have spread all over the US. Now, they've become an international phenomenon, moving back and forth across borders--especially to Mexico and Central America--to terrorize neighborhoods and commit crimes, including extortion and murder. For the next three days, Los Angeles Police Chief William Bratton is hosting an international summit on what to do. His counterparts from Mexico, El Salvador, Belize and Honduras along with the LA Sheriff's Department, FBI, DEA, and Immigration and Customs Enforcement are all in attendance. We hear how extortion and murder migrate across the borders. Can law enforcement agencies learn how to cooperate? Will they ever be more than a temporary solution?