CHICAGO: The immigration agents’ tear gas grenades clinked and then exploded against the concrete, shrouding the block in plumes of white gas. The dozen or so residents at the scene only screamed louder. “We don’t want you here,” yelled Rae Lindenberg. The 32-year-old, who works in marketing, ran out of her apartment when she heard the shrill sound of whistles.

CHICAGO: The immigration agents’ tear gas grenades clinked and then exploded against the concrete, shrouding the block in plumes of white gas. The dozen or so residents at the…

The city's patchwork of close-knit neighborhoods has created a type of zone defense meant to slow immigration agents and even force them to withdraw.