Intelligence Unit

**Intelligence Unit** is an elite unit of the Chicago Police Department that investigates and combats the city's major offenses, including organized crime, drug trafficking, and high-profile murders.

## Known Members (As of Season 1)

* Sergeant Hank Voight, Commander of the Intelligence Unit
* Senior Detective Alvin Olinsky, Senior Detective
* Detective Antonio Dawson, Senior Detective
* Detective Julie “Jules” Willhite, Junior Detective (1x01)
* Detective Jay Halstead, Junior Detective
* Detective Katie Morales,Junior Detective
* Detective Erin Lindsay, Junior Detective
* Detective Mia Sumner, Junior Detective (1x08-1x14)
* Detective Sheldon Jin, Intelligence Unit Tech Expert
* Officer Adam Ruzek, Intelligence Unit Officer

## Known Members (As of Season 2)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Senior Detective Alvin Olinsky, Senior Detective
* Detective Antonio Dawson, Senior Detective
* Detective Jay Halstead, Junior Detective
* Detective Katie Morales, Junior Detective
* Detective Erin Lindsay, Junior Detective
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kevin Atwater, Intelligence Unit Officer
* Nadia Decotis, Administrative Assistant

## Known Members (As of Season 3)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Senior Detective Alvin Olinsky, Senior Detective
* Detective Antonio Dawson, Senior Detective
* Detective Jay Halstead, Junior Detective
* Detective Katie Morales, Junior Detective
* Detective Erin Lindsay, Junior Detective
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Adam Ruzek, Intelligence Unit Officer
* Greg “Mouse” Gerwitz, Intelligence Unit Tech Expert

## Known Members (As of Season 4)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Alvin Olinsky, Senior Detective
* Detective Antonio Dawson, Senior Detective (4x01-4x08)
* Detective Jay Halstead, Junior Detective
* Detective Katie Morales, Junior Detective
* Detective Kenny Rixton, Junior Detective (4x10-4x15)
* Detective Erin Lindsay, Junior Detective
* Detective Hailey Upton, Junior Detective (4x21-4x23)
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer (4x09-4x23)
* Greg “Mouse” Gerwitz, Intelligence Unit Tech Expert (4x01-4x02; 4x05)

## Known Members (As of Season 5)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Alvin Olinsky, Senior Detective
* Detective Antonio Dawson, Senior Detective and Second-in-Command
* Detective Jay Halstead, Senior Detective
* Detective Katie Morales, Junior Detective
* Detective Hailey Upton, Junior Detective
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer

## Known Members (As of Season 6)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Antonio Dawson, Senior Detective and Second-in-Command
* Detective Jay Halstead, Senior Detective
* Detective Katie Morales, Senior Detective
* Detective Hailey Upton, Junior Detective
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer

## Known Members (As of Season 7)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Jay Halstead, Second-in-Command and Senior Detective
* Detective Katie Morales, Senior Detective
* Detective Hailey Upton, Junior Detective
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer
* Officer Vanessa Rojas, Intelligence Unit Officer

## Known Members (As of Season 8)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Jay Halstead, Second-in-Command and Senior Detective
* Detective Katie Morales, Senior Detective
* Detective Hailey Upton, Junior Detective
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer
* Officer Andre Cooper, Intelligence Unit Officer

## Known Members (As of Season 9)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Jay Halstead, Second-in-Command and Senior Detective
* Detective Katie Morales, Senior Detective
* Detective Hailey Upton, Junior Detective
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer

## Known Members (As of Season 10)

* Sergeant Hank Voight, Commanding Officer of the Intelligence Unit
* Detective Jay Halstead, Second-in-Command and Senior Detective
* Detective Katie Morales, Senior Detective
* Detective Hailey Upton, Junior Detective
* Officer Kevin Atwater, Intelligence Unit Officer
* Officer Adam Ruzek, Intelligence Unit Officer
* Officer Kim Burgess, Intelligence Unit Officer
* Officer Dante Torres, Intelligence Unit Officer

## Former members

* Detective Julie "Jules" Willhite Junior Detective (deceased)
* Detective Sheldon Jin Intelligence Unit tech expert (deceased)
* Detective Mia Sumner Junior Detective (transferred)
* Detective Kenny Rixton Junior Detective (transferred)
* Detective Erin Lindsay Junior Detective (resigned, joined FBI New York)
* Detective Alvin Olinsky Senior Detective (deceased)
* Detective Antonio Dawson Senior Detective (resigned)
* Officer Vanessa Rojas Intelligence Unit Officer (transferred)
* Greg "Mouse" Gerwitz Intelligence Unit tech expert (resigned)
* Nadia Decotis Administrative assistant (deceased)

## Radio communications

When using their radios, the members of the unit identify themselves with their unit number - which is 5021 (fifty twenty one) and their identifier (using the APCO radiotelephony spelling alphabet). For example, Adam Ruzek will identify himself on the radio as "5021 IDA". Voight is the Sergeant of the unit so does not have an identifier and just uses "5021".

## Trivia

* In real life, the Intelligence Section is based within the Counterterrorism Bureau.