Green’s Dictionary of Slang

bacon n.2

[ext. of pig n. (2a)]

the police.

[US]H. Ellison Deadly Streets (1983) 11: When the local bacon finally arrived, the guys had split.
[US]Da Bomb [Internet] bacon (n) The police. This donut shop smells like bacon. Slow down, I smell bacon. [University of British Columbia, Vancouver, BC, Canada, 1998].
[US]‘Touré’ Portable Promised Land (ms.) 156: We Words (My Favorite Things) [...] Pig. 5-0. Bacon.
[UK](con. 1980s) I. Welsh Skagboys 71: Naebody loves ex-bacon.
[US]T. Black Ringer [ebook] n.p.: If it was the pigs they'd be battering down the door and make no mistake, tends to get a wee bit jumpy when there's Class-As concerned, does Mr Bacon.