CHICAGO — On a humid September night in Chicago, Cameo Polk was asleep in his fifth-floor apartment when he heard the thump thump thump of a helicopter overhead.
Outside, hundreds of men with masks and rifles were scurrying around the building. He briefly wondered if an invasion was underway.
But they were U.S. law enforcement agents, rappelling from a Black Hawk helicopter and swarming the 130-unit building he lives in. Once inside, they kicked down doors, emptied bookshelves and overturned mattresses…