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AURORA, Colo. — The U.S. Immigration and Customs Enforcement detention center in Aurora is under fire for what a local nonprofit calls unfair treatment of its detainees.

The group Towards Justice has filed a class-action lawsuit claiming those being held are forced to work as janitors, cleaning bathrooms, pods and common areas for zero pay.

They say others who are in the voluntary work program only receive $1 a day.

A federal judge gave the lawsuit the go-ahead Friday. Lawyers for the 50,000 past and present detainees said the ruling was a huge step forward.