The Trump administration has invoked a 227-year-old law, the Alien Enemies Act, to target Tren de Aragua, a gang with its roots in the prisons of Venezuela. Who are they and how wide is their reach?

Tren de Aragua, a gang born out of a Venezuelan prison, is a loose network that doesn’t operate like groups typically considered terrorist organizations.

The deportation of 261 Venezuelans, including suspected members of the gang, was carried out on Saturday. By the time a federal court halted the move, two planes carrying immigrants had already left the country.