Three operational directorates comprise ICE — Homeland Security Investigations (HSI), Enforcement and Removal Operations (ERO) and Office of the Principal Legal Advisor (OPLA). A fourth directorate — Management and Administration — supports the three operational branches to advance the ICE mission.

Mission statement of ERO

To identify, arrest, and remove aliens who present a danger to national security or are a risk to public safety, as well as those who enter the United States illegally or otherwise undermine the integrity of our immigration laws and our border control efforts. Enforcement and Removal Operations (ERO) upholds America's immigration laws at, within and beyond our borders through efficient enforcement and removal operations.