U.S Department of Homeland Security

The United States Department of Homeland Security is........

U.S Immigration and Customs Enforcement

 * ICE Supervisory Special Agent - _____ _____, Group Supervisor - (Chicago PD S5 E3)
 * ICE Supervisory Special Agent - Austin Stevens, (FBI: Most Wanted S1 E9)
 * Port Chester, New York Reginal Field Office
 * ICE Supervisory Special Agent - Michael Rees, (FBI: Most Wanted S1 E9)
 * ICE Detection Facility in Ashburn, Georgia
 * ICE Special Agent - Thomas M. Gilman, (FBI S1 E18)
 * Port Chester, New York Reginal Field Office

Department of Homeland Security

 * Deputy Director - Steven Grimes, Head of Intelligence and Analysis (Chicago Fire S4 E13)
 * Special Agent - ___ McManus, (Chicago Med S1 E6)
 * Special Agent - ___ Ramirez, (Chicago Med S1 E6)
 * Special Agent - Zoey Cortina, (FBI: Most Wanted S1 E_)
 * Special Agent - Alex Ward, (Chicago Fire S4 E11 - E13)

Office of Inspector General

 * Special Agent - Moses Reed, (FBI: Most Wanted S2 E15)

Federal Protective Service

 * Detective - Kim Hollins, (FBI S4 E1)

U.S Secret Service

 * Chicago Field Office: Special Agent - Joe Hill (Chicago PD S1 E3)