5 U.S.C. § 8126. Subpenas; oaths; examination of witnesses

The Secretary of Labor, on any matter within his jurisdiction under this subchapter, may—

1. (1)
   (1)issue subpenas for and compel the attendance of witnesses within a radius of 100 miles;
2. (2)
   (2)administer oaths;
3. (3)
   (3)examine witnesses; and
4. (4)
   (4)require the production of books, papers, documents, and other evidence.