The Specially Designated Nationals (SDN) list is published by the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) and includes individuals and companies that are owned, controlled by, or acting on behalf of targeted countries. It also includes entities like terrorists and narcotics traffickers who are designated under non-country-specific programs. Assets belonging to those on the SDN list are blocked, and U.S. persons are generally prohibited from engaging in any transactions with them. This list is part of OFAC’s efforts to enforce economic sanctions.