President Trump on Saturday invoked the Alien Enemies Act of 1798 to order the swift detention and deportation of all Venezuelan migrants suspected of being members of the Tren de Aragua prison gang,

Human rights advocates warn that the deportees legal rights were violated as they were transferred to the CECOT, a mega-prison established by El Salvador’s President Nayib Bukele for his crackdown on gangs in the country. The facility, according to the Associated Press, can hold up to 40,000 inmates; up to 70 people are housed in a single cell.