In the letter, shown below, the Brennan Center, the Center on Privacy & Technology at Georgetown Law, the National Immigrant Justice Center, and 109 other groups demand that the Department of Homeland Security (DHS) and the Department of Health and Human Services (HHS) stop the inhumane and illegal policy of using information obtained from vulnerable immigrant children to find, arrest, and deport their parents and relatives when they come forward to assume responsibility for the children. The first arrests took place last summer and the practice was formalized as policy this spring by DHS and HHS. Given the continued danger to immigrant children, as evidenced last weekend by the tear gas fired by American officers to push immigrants, including families, from the border fence, the need to protect these children from cruel and inhumane treatment has never been greater.