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From Primetime Emmy Award winner Dick Wolf (Law & Order) comes the gripping fourth season of this acclaimed drama following the men and women of the Chicago Police Department's Intelligence Unit. Led by Sgt. Hank Voight (Jason Beghe) , the diverse team takes on a demanding roster of cases, including possible terrorist activity, the murder of a sex offender, and a ruthless cop killer. Loyalties are tested and boundaries - both personal and professional - are pushed in all 23 action-packed episodes, collected here to enjoy back-to-back and uninterrupted.

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