The Clerk of that court commanded Secretary O’Neill to produce certified copies of all federal Statutes at Large which create a specific liability for income taxes imposed by subtitle A of the Internal Revenue Code. All Acts of Congress are first published in the Statutes at Large; some are later codified in the U.S. Code.
https://supremelaw.org/press/rels/subpoena.htm
also
https://www.supremelaw.org/cc/eddings/subpoena.liability.htm
Documentary
IRS mentioned 6 times by Q
