Countering Transnational Organized Crime (CTOC) supports investigations and operations related to transnational crime, financial and narcotics violations, human trafficking, human smuggling, and public safety.

It also supports law enforcement partners through training, technical assistance, forensic laboratory analysis, and worksite enforcement.

CTOC includes the Financial and Fraud and Public Safety and Border Security Divisions, which integrate a variety of programs and operations that investigate transnational criminal organizations; support field office investigations through training and capacity building; and partner with governmental, non-governmental, and industry organizations to disrupt and/or dismantle criminal networks.

In addition, CTOC is responsible for providing investigative support services, including technical assistance and guidance to all HSI undercover operations, polygraph operations, tactical and emergency response programs, victim assistance, and special agent basic training, as well as overseeing the HSI Forensic Laboratory.