(a) The Secretary shall have power when he believes it necessary in order to determine whether any person has violated or is about to violate any provision of this chapter (except subchapter II of this chapter) to make an investigation and in connection therewith he may enter such places and inspect such records and accounts and question such persons as he may deem necessary to enable him to determine the facts relative thereto. The Secretary may report to interested persons or officials concerning the facts required to be shown in any report required by this chapter and concerning the reasons for failure or refusal to file such a report or any other matter which he deems to be appropriate as a result of such an investigation.

(b) For the purpose of any investigation provided for in this chapter, the provisions of sections 49 and 50 of title 15 (relating to the attendance of witnesses and the production of books, papers, and documents), are made applicable to the jurisdiction, powers, and duties of the Secretary or any officers designated by him.