Abbreviate the whole phrase

Warning²Federal courts, Illinois courts21st and 22nd editions

Some names abbreviate as whole phrases rather than word by word, so a speaker’s title and institution do too — “U.S. Sec’y of State”, not “United States Sec’y of State”.¹

1. 1R. 17.2.6 Speeches and Addresses. Tables: T6 Case Names and Institutional Authors in Citations.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.