Office of Foreign Asset Control published a list of people and organizations whose assets have been blocked in United States

The Office of Foreign Assets Control (OFAC) is a financial intelligence and enforcement agency of the U.S. Treasury Department. It administers and enforces of economic and trade sanctions in support of U.S. national security and foreign policy objectives. Under Presidential national emergency powers, OFAC carries out its activities against foreign states as well as a variety of other organizations and individuals, like terrorist groups, deemed to be a threat to U.S. national security.

As a component of the U.S. Treasury Department, OFAC operates under the Office of Terrorism and Financial Intelligence and is primarily composed of intelligence targeters and lawyers. While many of OFAC's targets are broadly set by the White House, most individual cases are developed as a result of investigations by OFAC's Office of Global Targeting (OGT).

Sometimes described as one of the "most powerful yet unknown" government agencies, OFAC was founded in 1950 and has the power to levy significant penalties against entities that defy its directives, including imposing fines, freezing assets, and barring parties from operating in the United States. In 2014, OFAC reached a record $963 million settlement with the French bank BNP Paribas, which was a portion of an $8.9 billion penalty imposed in relation to the case as a whole.

OFAC publishes a list of Specially Designated Nationals (SDNs), which lists people, organizations, and vessels with whom U.S. citizens and permanent residents are prohibited from doing business. This list differs from the list maintained pursuant to Section 314(a) of the Patriot Act.

When an entity or individual is placed on the SDN list it can petition OFAC to reconsider. But OFAC is not required to remove an individual or entity from the SDN list. Two federal court cases have found the current Treasury/OFAC process to be constitutionally deficient.

In August 2009, a federal court ruling in KindHearts v. Treasury found that Treasury's seizure of KindHearts assets without notice or means of appeal is a violation of the Fourth and Fifth Amendments.

On September 23, 2011, the Ninth Circuit Court of Appeals upheld a lower court's ruling that procedures used by Treasury to shut down the Oregon-based Al Haramain Islamic Foundation in 2004 was unconstitutional. The court said the Fifth Amendment's guarantee of due process required Treasury to give adequate notice of the reasons it puts a group on the terrorist list, as well as a meaningful opportunity to respond. In addition, the court ruled that freezing the group's assets amounts to a seizure under the Fourth Amendment, so that a court order is required.

As of October 7, 2015, the SDN List had more than 15,200 entries from 155 countries. Of those, 178 entries were for aircraft and 575 entries were for ships ("vessels"). The remaining 14,467 entries were for designated individuals and organizations. OFAC creates separate entries in the SDN list for each alias of a designee, so the number of entries does not reflect the number of designees.