U.S. Immigration and Customs Enforcement (ICE) protects America from the cross-border crime and illegal immigration that threaten national security and public safety. To carry out that mission, ICE focuses on smart immigration enforcement, preventing terrorism, and combating transnational criminal threats. The agency has an annual budget of approximately $6 billion, primarily devoted to three operational directorates—Enforcement and Removal Operations (ERO), Homeland Security Investigations (HSI), and the Office of the Principal Legal Advisor (OPLA). A fourth directorate—Management and Administration (M&A)—supports the three operational branches to advance the ICE mission.