5 U.S.C. § 578

An arbitrator to whom a dispute is referred under this subchapter may— (1) regulate the course of and conduct arbitral hearings; (2) administer oaths and affirmations; (3) compel the attendance of witnesses and production of evidence at the hearing under the provisions of section 7 of title 9 only to the extent the agency involved is otherwise authorized by law to do so; and (4) make awards.