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The Evanston police officers stepped out of their squad cars and into a pressure cooker.

By the time they arrived at the normally subdued south Evanston intersection that Halloween afternoon , a car crash involving a red sedan and an SUV full of U.S. Customs and Border Protection agents had devolved into violence and chaos.

The sedan’s driver and two other people — all U.S. citizens — already had been detained. One of them, a young Chicago man, was captured on witness video being wrestled to the pavement and punched in the head while handcuffed.

With their body-worn cameras rolling, Evanston officers encountered armed federal agents surrounded by an angry crowd shouting for the three citizens to be released. Some chastised agents for bei

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