The primary prohibition on material support of terrorism is in the Anti-Terrorism and Effective Death Penalty Act (AEDPA), which prohibits material support to Foreign Terrorist Organizations (FTOs) designated by the Secretary of State.

In addition to the FTO list, the material support prohibition also applies to a broader list of terrorist entities and individuals designated by the Department of Treasury under sanctions laws, primarily the International Emergency Economic Powers Act (IEEPA). Executive Orders issued under authority of various sanctions statutes have also included a prohibition on providing material support, without defining it. In the absence of a definition, the AEDPA definition is generally referred to for sanctions compliance purposes.

List Maintained by Authority
Foreign Terrorist Organization (FTO)
(organizations listed here are co-listed as SDNs)
State Department Anti-Terrorism and Effective Death Penalty Act (AEDPA)
Specially Designated National (SDN) Treasury Department International Emergency Economic Powers Act (IEEPA)
and various sanctions statutes and Executive Orders
Specially Designated Global Terrorist (SDGT)*
(broader in scope than FTO list;
can include individuals
and organizations)
Treasury Department Executive Order 13224 (2001)
under authority of IEEPA as amended by
the PATRIOT Act
Specially Designated Terrorist (SDT)* –
those who threaten the Middle East peace process
Treasury Department Set out in Executive Order 12947 (1995)[1]
and expanded in EO 13099 (1998)
under authority of IEEPA

*  Individuals and groups on these two lists, along with individuals and entities listed under various U.S. sanctions programs, narcotics traffickers, money launderers, etc., are collectively referred to as Specially Designated Nationals (SDNs). Treasury maintains a searchable database of all SDNs at https://www.treasury.gov/resource-center/sanctions/SDN-List/Pages/default.aspx

[1] Pursuant to the president’s authority under the International Emergency Economic Powers Act (IEEPA) (1977), which authorizes the president to declare a state of emergency relating to any “unusual and extraordinary threat” outside the U.S. EO 12947 was the first time IEEPA was used to designate non-state entities.