Green’s Dictionary of Slang

(US) a police officer; a member of the highway patrol.

1949		Monteleone Criminal Sl. (rev. edn) 30: boogie man A turnkey in a jail or prison.
1967–9		in DARE I 335/2: A policeman Buggerman [...] Boogerman [...] Not a white man, not a nigger in this country don’t know what you’re talkin about. You call the boogerman. They’re talkin about the highway patrol.