Follows District 21 of the Chicago Police Department, which is made up of two distinctly different groups: the uniformed cops and the Intelligence Unit.
![](https://cloudcdn.monster/images/b/w1280/193341699f4d1ffdd8e2665257cf58f9.jpg)
Stars
![](https://cloudcdn.monster/images/f/w185/be81497c66aef7c9ad5fea2d7166200d.jpg)
Jason Beghe
![](https://cloudcdn.monster/images/f/w185/31a6b7c18f7ee0403377168300ca60f5.jpg)
Jesse Lee Soffer
![](https://cloudcdn.monster/images/f/w185/cee900cf64829de23879f3e26b5a89b6.jpg)
Patrick John Flueger
![](https://cloudcdn.monster/images/f/w185/1fa93eff18f4dac4132b9fe9ba116f86.jpg)
Marina Squerciati
![](https://cloudcdn.monster/images/f/w185/89d1f40e22607c2cc7cdc0ee9b0c7db7.jpg)
LaRoyce Hawkins
![](https://cloudcdn.monster/images/f/w185/35d7fe716f9123d2b62992bc91675412.jpg)
Amy Morton
![](https://cloudcdn.monster/images/f/w185/fc1271e7f64e8767e2d1a5c0b1d5d9d9.jpg)
Jon Seda
![](https://cloudcdn.monster/images/f/w185/27d45e0538867356741f85842a14598e.jpg)
Tracy Spiridakos
![](https://cloudcdn.monster/images/f/w185/6cfa21d436f3a68dd9fe9b0128a7c511.jpg)
Mark Tinker