A History of Short Words

From the New York Times Crossword Puzzle

KGB

Sat, 9 Apr '22
Cold War inits.
Sat, 28 Aug '21
"Bridge of Spies" org.
Wed, 21 Jul '21
Cold War inits.
Mon, 22 Feb '21
U.S.S.R. intelligence org.
Wed, 30 Dec '20
Illya Kuryakin's org. in the film "The Man From U.N.C.L.E."