Green’s Dictionary of Slang

eye adj.

[eye n. (3)]

(US Und.) pertaining to the Pinkerton Detective Agency.

[US]Flynt & Walton Powers That Prey 32: You coppers got to help him. I ain’t going to have the Eye people snake in all the loose coin; I give it to you straight.
[US]D. Maurer Big Con 148: The jug where his cush is, is an eye gaff.