CHICAGO — For several weeks in September and early October, highly publicized protests in the small suburb of Broadview roughly 12 miles west of Chicago focused attention to a little-known facility operated by U.S. Immigration and Customs Enforcement.

The building kept a low profile for most of its 19-year history. There was a weekly prayer vigil, started by a pair of nuns in 2007 , usually the only crowds attracted to the facility. But the launch of the Trump administration’s “Operation Midway Blitz” Chicago-area immigration enforcement campaign last month drew protesters to Broadview, where they were met by tear gas and pepper balls.

But for all the sudden public awareness of the ICE processing center — thanks to the commotion outside of its walls — the facility’s interior is a “blac

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