Green’s Dictionary of Slang

A.W. n.

[abbr.; note A.C. n. and A.B. n. (3)]

(US prison) Aryan Warrior, a white supremacist prison gang.

[US]Other Side of the Wall: Prisoner’s Dict. July [Internet] AW: Associate Warden. In some western prisons, this may refer to the Aryan Warrior gang.