CHICAGO (NewsNation) — Some residents in Chicago's largely Latino neighborhoods have become literal whistleblowers as advocates try to put residents on alert that federal immigration enforcement officers, who have arrived by the hundreds this month, may be closing in.

More than 250 people have been arrested by federal officers since "Operation Midway Blitz" began last week in Chicago, officials told NewsNation.

"President Trump has been clear: if politicians will not put the safety of their citizens first, this administration will," Department of Homeland Security Secretary Kristi Noem wrote in a social media post Tuesday. "I was on the ground in Chicago today to make clear we are not backing down."

In response, initiatives aimed at protecting migrants without legal immigration status i

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