As Arizona turns up the heat on illegal immigrants, civil rights groups are demanding the U.S. Immigration and Customs Enforcement (ICE) release details about a rapidly expanding federal program that helps local police identify illegal immigrants for potential deportation. The Center for Constitutional Rights and two other groups filed a lawsuit on April 27 attempting to force ICE to turn over data about its “Secure Communities” program after failing to get the information through a Freedom of Information Act request.

“This program has very little public scrutiny. There’s very little known about the way it operates,” said Sunita ...