Green’s Dictionary of Slang

KGB n.

[the old name for the Soviet secret service + ? link to K-9 n.]

(N.Z. prison) the prison drug squad.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 99/1: KGB, the n. 1 the drug squad, the officers who handle the police narcotics detection dogs.