On April 27, the U.S. Treasury Department’s Office of Foreign Assets Control (OFAC) announced sanctions, pursuant to Executive Order 14078, against four senior officials of Iran’s Islamic Revolutionary Guard Corps Intelligence Organization (IRGC-IO). The IRGC-IO was concurrently designated by the State Department for its involvement in the hostage-taking or wrongful detention of U.S. nationals in Iran. OFAC also implemented the State Department’s designation of Russia’s Federal Security Service as well as the IRGC-IO for their role in wrongfully detaining U.S. nationals abroad. As a result of the sanctions, all property and interests in property of the designated persons that are in the United States or in the possession or control of U.S. persons must be blocked and reported to OFAC. Additionally, “any entities that are owned, directly or indirectly, individually or in the aggregate, 50 percent or more by one or more blocked persons are also blocked.” OFAC’s announcement further noted that its regulations “generally prohibit” U.S. persons from participating in transactions with designated persons unless exempt or otherwise authorized by a general or specific license. Financial institutions and persons that engage in certain transactions with the designated persons may themselves be exposed to sanctions or subject to enforcement.