You know the story by now. It’s been reported everywhere from the Tribune to Al Jazeera, mainly in positive terms: crowd of thousands on the Magnificent Mile, largest U.S. protest on the third anniversary of the Iraq war, peaceful, no arrests, joy all around.

But behind the scenes, March 18 was just the latest chapter in Andy Thayer’s unending tug-of-war with the city and its police department.

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