Inside El Salvador’s Mega Prison Holding Thousands of Gang Members 🏢

Violent gang wars in El Salvador have earned the central American nation the label of "the most dangerous country in the world". The country's president has come up with a solution - declare a ruthless war on the gangs and lock up their members in the world's biggest and toughest prison. This week Foreign Correspondent goes inside El Salvador’s mega prison, described by critics as a "black hole of human rights".