Overview of ICE: History, Structure, and Operations

U.S. Immigration and Customs Enforcement (ICE)

An Academic Overview of Structure, History, and Operations

What is ICE?

A federal law enforcement agency under the Department of Homeland Security (DHS).

Formed in 2003 via the Homeland Security Act of 2002.

Combines functions of the former INS (Immigration and Naturalization Service) and U.S. Customs Service.

Historical Context: Post-9/11

The creation of ICE was a direct response to the September 11, 2001 attacks. The government sought to consolidate border, customs, and immigration enforcement into a single cohesive department to improve national security and information sharing.

Organizational Structure: Two Main Pillars

ERO

Enforcement and Removal Operations. Focuses on apprehension, detention, and deportation of undocumented immigrants inside the U.S.

HSI

Homeland Security Investigations. disrupted transnational crime, such as human trafficking, drug smuggling, and financial crimes.

Workforce & Operations Scale

ICE manages a budget of approximately $8-9 billion (FY2023 est) and employs over 20,000 personnel across 400+ offices worldwide.

Enforcement and Removal Operations (ERO)

ERO manages the custody of foreign nationals who are detained. This includes the management of detention centers and the logistical coordination of removing individuals from the United States.

Homeland Security Investigations (HSI)

Investigates cross-border criminal activity.

Targets: Gangs, financial fraud, intellectual property theft, and cybercrime.

Operation Community Shield: A major initiative targeting violent street gangs like MS-13.

Operating Model: Detention

ICE maintains a network of detention facilities to hold individuals during their removal proceedings. These facilities are either owned by ICE, or contracted through local jails and private companies.

Common Confusion: ICE vs. CBP

CBP (Border Patrol)

Operates AT the border and ports of entry. Their primary role is interdiction—stopping people and goods from entering illegally at the line.

ICE (Interior)

Operates INSIDE the U.S. Investigates employers, detains undocumented immigrants already here, and dismantles criminal networks.

Summary & Mission

ICE enforces federal laws governing border control, customs, trade, and immigration to promote homeland security and public safety. Its dual mission involves both administrative removal of undocumented residents (ERO) and criminal investigation of transnational networks (HSI).