18 U.S.C. § 3046
Warrant or summons—(Rule)
(June 25, 1948, ch. 645, 62 Stat. 816.)
See Federal Rules of Criminal Procedure Issuance upon complaint, Rule 4. Issuance upon indictment, Rule 9. Summons on request of government; form; contents; service; return, Rules 4, 9.