Pursuant to regulations prescribed by the Commissioner of U.S. Customs and Border Protection with the approval of the Secretary of the Treasury, the baggage and effects of alien officers and employees of international organizations, or of aliens designated by foreign governments to serve as their representatives in or to such organizations, or of the families, suites, and servants of such officers, employees, or representatives shall be admitted (when imported in connection with the arrival of the owner) free of customs duties and free of internal-revenue taxes imposed upon or by reason of importation.