National Geographic - Worlds Most Dangerous Gang

You've spotted the graffiti and seen their tattoos. And you've read the shocking headlines documenting their brutality. But what is driving the rapid spread of the ultra violent gang MS-13, which has infected big cities and small towns across the country. Lisa Ling takes you deep inside a merciless world hidden in plain view. Through revealing interviews with active members, National Geographic reveals the extreme culture and rituals of the MS-13 gang.