I thought glowie was a term used to describe undercover FBI/CIA agents. It's in frequent use in leftist (communist/anarchist, not liberal democrat) forums. Is

I thought glowie was a term used to describe undercover FBI/CIA agents. It's in frequent use in leftist (communist/anarchist, not liberal democrat) forums. Is there actual substance behind this claim of its origins or is it yet another tired attempt to rewrite language for no particular reason?