50 U.S.C. § 211 : US Code - Section 211: Investigations to detect and prevent frauds and abuses

Search 50 U.S.C. § 211 : US Code - Section 211: Investigations to detect and prevent frauds and abuses

It shall be the duty of the Secretary of the Treasury, from time
to time, to institute such investigations as may be necessary to
detect and prevent frauds and abuses in any trade or transactions
which may be licensed between inhabitants of loyal States and of
States in insurrection. And the agents making such investigations
shall have power to compel the attendance of witnesses, and to make
examinations on oath.