The crown jewel of El Salvador's aggressive anti-crime strategy — a mega-prison where visitation, recreation and education are not allowed — became the latest tool in U.S. President Donald Trump's crackdown on immigration on Sunday, when hundreds of immigrants facing deportation were transferred there.

The crown jewel of El Salvador’s aggressive anti-crime strategy — a mega-prison where visitation, recreation and education are not allowed — became the latest tool in U.S. President Donald Trump’s crackdown on immigration on Sunday, when hundreds of immigrants facing deportation were transferred there.