The Specially Designated Nationals and Blocked Persons List, also known as the SDN List, is a United States government sanctions/embargo measure targeting U.S.-designated terrorists, officials and beneficiaries of certain authoritarian regimes, and international criminals (e.g., drug traffickers). The list is managed by the Office of Foreign Assets Control.
The SDN list contains tens of thousands of companies, organizations, and individuals who have been identified as posing a threat to U.S. national security and foreign and economic policy. All persons and businesses within the U.S. are prohibited from doing business with blacklisted individuals or are subject to sanctions for violating the law. Financial sanctions include a ban on investment in the stock of the blacklisted individuals and companies in which the blacklisted individuals have a controlling interest, and a ban on new debt (including all securities such as bonds, credits, bills of exchange, etc.) with a maturity of more than 90 days. After the Crimean crisis, the US blacklisted a number of Russian and Crimean companies for sanctions. Almost every country is represented on the list, but China has 250 persons listed.