company
Stasi
espiocrat
dangle
counterespionage
penetrate
spying
earwig
CHIS
Deep Throat
counterspying
double agent
spook
stooge
boots on the ground
HUMINT
detective
blabber
informer
outplacement
betrayer
rat
spy
undercover agent
intelligence community
alphabet
USACIL
U.S. Army Criminal Investigation Laboratory
supergrass
United States Army Criminal Investigation Laboratory
scrutator
sleeper agent
US Army Criminal Investigation Laboratory
beagle
bespy
hotel detective
intelligence agent
secret agent
United States intelligence agency
house detective
intelligence officer
house dick