When undocumented workers are caught they get sent to a detention facility run by Immigration and Customs Enforcement (ICE).

There are dozens of detention facilities across the US and some immigrants are even kept in actual prisons with convicted criminals.

There have been accusations of mistreatment, lack of medical care, and lack of attorney access at some of these detention facilities.

The ACLU successfully sued the ICE to have undocumented families removed from one of the detention facilities because of the conditions.

Now, the ACLU is calling for federal oversight for the detention centres to ensure that there are standards in place.

Al Jazeera's Mike Kirsch reports.