Any material which is received by the Commission in any investigation, a purpose of which is to determine whether any person may have violated any provision of the laws administered by the Commission, and which is provided pursuant to any compulsory process under this subchapter or which is provided voluntarily in place of such compulsory process shall not be required to be disclosed under section
552 of title
5 or any other provision of law, except as provided in paragraph (2)(B) of this section.