50 U.S.C. § 206

section 205 of this titleWhenever any part of a State not declared to be in insurrection is under the control of insurgents, or is in dangerous proximity to places under their control, all commercial intercourse therein and therewith shall be subject to the prohibitions and conditions of for such time and to such extent as shall become necessary to protect the public interests, and be directed by the Secretary of the Treasury, with the approval of the President.