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 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?

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.