Chicago Police Superintendent Garry McCarthy looks on as people rally in Federal Plaza after marching from Union Park for May Day. (Antonio Perez/Chicago Tribune)

Chicago Police Superintendent Garry McCarthy looks on as people rally in Federal Plaza after marching from Union Park for May Day.

( Antonio Perez/Chicago Tribune / May 1, 2012 )

Chicago Police Superintendent Garry McCarthy looks on as people rally in Federal Plaza after marching from Union Park for May Day.

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