§ 526.201 Prohibited transactions.
(a) All property and interests in property that are in the United States, that come within the United States, or that are or come within the possession or control of any U.S. person of the following persons are blocked and may not be transferred, paid, exported, withdrawn, or otherwise dealt in:
(1) Any foreign person determined by the Secretary of State, in consultation with the Secretary of the Treasury and the Attorney General:
(i) To be responsible for or complicit in, to have directly or indirectly engaged in, or to be responsible for ordering, controlling, or otherwise directing, the hostage-taking of a United States national or the wrongful detention of a United States national abroad;
(ii) To have attempted to engage in any activity described in paragraph (a)(1)(i) of this section; or
(iii) To be or have been a leader or official of an entity that has engaged in, or whose members have engaged in, any of the activities described in paragraph (a)(1)(i) or (ii) of this section relating to the leader's or official's tenure;
(2) Any foreign person determined by the Secretary of the Treasury, in consultation with the Secretary of State and the Attorney General: