31 C.F.R. § 596.201
Except as authorized by regulations, orders, directives, rulings, instructions, licenses, or otherwise, no United States person, on or after the effective date, knowing or having reasonable cause to know that a country is designated under section 6(j) of the Export Administration Act, 50 U.S.C. App. 2405, as a country supporting international terrorism, shall engage in a financial transaction with the government of that country.
Note to § 596.201 : The name of each country that has been designated under section 6(j) of the Export Administration Act, 50 U.S.C. App. 2405, as a country supporting international terrorism is published in the FEDERAL REGISTER by the Department of State, and a complete list of countries currently so designated can be found via the Web site of the Department of State at http://www.state.gov/j/ct/.
31 C.F.R. §596.201