The group has received reports this week that detainees from the island have been sent to the Florida facility and allege "rights violations and dehumanizing treatment" there.

A class-action lawsuit filed Wednesday is challenging conditions at Florida's undocumented migrant detention facility known as Alligator Alcatraz.

The ACLU, ACLU of Florida and Americans for Immigrant Justice are working with detainees and other groups representing them, including Florida Keys Immigration, Sanctuary of the South, U.S. Immigration Law Counsel, Victoria Slatton of Sanabria & Associates, and the Law Offices of Catherine Perez, PLLC.