Secretary of State Marco Rubio said 17 men he described as violent criminals from the Tren de Aragua gang have been transferred to El Salvador.

The Tren de Aragua has been on the radar of U.S. authorities for years. But it wasn’t until Trump campaigned for a second White House term that the gang became widely known in the U.S., as he and his allies turned the group into the face of the alleged threat posed by immigrants living in the country illegally.

NBC News' David Noriega spoke with Gadi Schwartz about the Venezuelan gang Tren de Aragua, who operate in multiple countries, including the U.S. The gang made news as President Trump used the "Alien Enemies Act" to justify the deportation of immigrants accused of being members of the gang to be sent to El Salvador's mega prison.