The Secretary of Labor, on any matter within his jurisdiction under this subchapter, may—
(1) issue subpenas for and compel the attendance of witnesses within a radius of 100 miles;
(2) administer oaths;
(3) examine witnesses; and
(4) require the production of books, papers, documents, and other evidence.
(Pub. L. 89–554, Sept. 6, 1966, 80 Stat. 545.)