A History of Short Words

From the New York Times Crossword Puzzle

IRS

Sun, 31 Oct '21
Distributor of CARES Act funds
Sun, 12 Sep '21
They await your return, in brief
Sun, 30 May '21
Org. with a complex code
Sun, 25 Apr '21
Auditing org.
Sun, 17 Jan '21
Org. that takes many forms
Tue, 5 Jan '21
Org. with an inspector general