A bill to amend the United Nations Participation Act of 1945 to halt the importation of Rhodesian chrome.

Amends the United Nations Participation Act of 1945 to permit enforcement of any executive order restricting the importation of Rhodesian chrome, pursuant to any United Nations Security Council resolution. Requires that steel mill products containing chromium not be imported while such executive order is in effect without the filing of a certificate of origin with the Secretary of the Treasury unless such shipment is released by the Secretary. Authorizes the Secretary to prescribe regulations to carry out this provision.