under this subsection. Classified information shall not be subject to disclosure for such time as it remains classified, except that such information may be disclosed to a court ex parte and in camera for purposes of judicial review under subsection (c). (4) Period of designation (A) In general A designation under this subsection shall be effective until revoked under paragraph (5) or (6) or set aside pursuant to subsection (c). (B) Review of designation upon petition (i) In general The Secretary shall review the designation of a foreign Special Transnational Criminal Organization under the procedures set forth in clauses (iii) and (iv) if the designated organization files a petition for revocation within the petition period described in clause (ii). (ii) Petition period For purposes of clause (i)— (I) if the designated organization has not previously filed a petition for revocation under this subparagraph, the petition period begins 2 years after the date on which the designation was made