Tren de Aragua (Train of Aragua, or Aragua Train) has roots in Tocorón prison in Venezuela’s northern Aragua state, which the group’s leaders had transformed into a mini-city with a pool, restaurants and a zoo.

A federal judge on Saturday night ordered an immediate two-week halt to all deportations of Venezuelan illegal immigrants with ties to the Tren de Aragua gang as he weighs the legality of President Donald Trump‘s invocation of the Alien Enemies Act to do so.

Claiming that the Nicolás Maduro regime has launched an invasion of the United States through a dangerous gang, President Donald Trump on Saturday invoked the war powers contemplated in a centuries-old act to assume the authority necessary to expedite mass deportation of Venezuelans citizens.