President Trump’s executive order on Saturday invoking the Alien Enemies Act targeted Venezuelan citizens 14 years and older with ties to the transnational gang Tren de Aragua, saying they “are liable to be apprehended, restrained, secured, and removed as Alien Enemies.”

Mr. Trump’s order was quickly challenged in court, but the gang has been a growing source of concern for U.S. officials over the last year. The Biden administration labeled Tren de Aragua a transnational criminal organization in 2024, the New York Police Department has highlighted its activity on the East Coast, and the Trump White House began the process of designating it a foreign terrorist organization in January.

Here is what we know about the gang:

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. They reportedly recorded executions and torture there to maintain control over other prisoners.

As Venezuela’s economy collapsed and its government under President Nicolás Maduro became more repressive, the group began exploiting vulnerable migrants. Tren de Aragua’s influence soon stretched into other parts of Latin America, and it developed into one of the region’s most violent and notorious criminal organizations, focusing on sex trafficking, human smuggling and drugs.

Colombian officials in 2022 accused the gang of at least 23 murders after the police began to find body parts in bags. Alleged members have also been apprehended in Chile and in Brazil, where the gang aligned itself with Primeiro Comando da Capital, one of that country’s biggest organized crime rings.

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