Family members of Venezuelan migrants who suspect their loved ones were sent to El Salvador as part of a rapid U.S. deportation operation over the weekend are struggling to get more information as a legal battle plays out.

El Salvador’s Cecot mega-prison was notorious long before the Trump administration’s recent decision to deport hundreds of alleged Venezuelan gang members there.

The crown jewel of El Salvador’s aggressive anti-crime strategy is a mega-prison where visitation, recreation and education are not allowed.