Activists in Chicago have been tracking federal immigration enforcement agents' movements, following their cars and alerting neighbors with whistles. This resistance sprang into action in response to Trump's Operation Midway Blitz, but it's nearly a decade in the making.

NPR's Odette Yousef has the story of a strategy that activists hope can be a blueprint.

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This episode was produced by Connor Donevan. It was edited by Andrew Sussman and Courtney Dorning. Our executive producer is Sami Yenigun.

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