36 CFR § 703.22
Where to serve demands
November 4, 2020
Requesting parties must serve subpoenas:
(a) For Congressional Research Service matters: Director, Congressional Research Service, LM 203, Library of Congress, Washington, DC 20540.
(b) For Law Library matters: Law Librarian, LM 240, Library of Congress, Washington, DC 20540.
(c) For all other matters: General Counsel, LM 601, Library of Congress, Washington, DC 20540.