investigations transnational criminal investigative units (a) In general Subtitle D of title IV of the Homeland Security Act of 2002 ( 6 U.S.C. 231 et seq.), as amended by this title, is further amended by adding at the end the following new section: 449. Transnational criminal investigative units (a) Establishment There is established within the Department a program, which shall be known as the Homeland Security Investigations Transnational Criminal Investigative Unit Program (referred to in this section as TCIU Program ). The TCIU Program shall be headed by an Assistant Director, who shall be appointed by the Executive Associate Director of U.S. Immigration and Customs Enforcement, Homeland Security Investigations. (b) Purpose The purpose of the TCIU Program shall be to— (1) lead homeland security investigations into transnational criminal organizations