For many in El Salvador, life hangs in the balance, amid fears of brutal gangs

Extraordinary violence is among the factors pushing Central Americans north toward the U.S. In El Salvador, rival gangs like MS-13 and the 18th Street Gang kill thousands per year, despite a harsh crackdown by law enforcement. Special correspondent Danny Gold reports from San Martin on how these brutal groups control the population and drive one of the highest murder rates in the world.