20 CFR §259.4

In performing his or her responsibilities under § 259.1 or § 259.3, the General Counsel or his or her designee shall have the authority and the power to conduct any investigations he deems necessary. In addition, the General Counsel or his or her designee shall have the power to compel, by subpoena, any person, company, corporation, or other entity to produce any records or other documents pertinent to the matter under consideration.