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.)