When federal immigration agents moved into Chicago’s streets, the sound of whistles followed. For months, the sharp blasts rang through many of the city’s neighborhoods, alerting residents to the presence of agents and attracting observers and protesters.

The whistles have grown into a symbol of resistance in Chicago — and have already spread to other parts of the country targeted by President Donald Trump’s immigration blitz.

“It’s effective because people start understanding that if they hear the whistle, they should run or hide,” said Baltazar Enriquez, president of the Little Village Community Council. “Our idea of the whistle grew like wildfire.”

As federal immigration agencies this week ramp up their enforcement in Charlotte, North Carolina, making more than 130 arrests over the w

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