Benedict Arnold
Brutus
Judas
Judas Iscariot
Judas-like
Quisling
Trojan-horse
Vicar of Bray
apostate
archtraitor
backslider
betrayer
betraying
bolter
cockatrice
collaborationist
collaborator
conniver
conspirator
conspirer
convert
defector
deserter
double agent
double-crosser
double-crossing
double-dealer
fifth columnist
fifth-column
informer
intrigant
intriguer
machinator
mugwump
plotter
proselyte
quisling
quislingistic
rat
recidivist
recreant
renegade
renegado
renegate
reversionist
runagate
quitter
black-armoured
careth
coldhearted
double-dyed
duellist
head-banging
heresiarch
honorless
lecher
low-life
mutineer
princeling
puft
red-furred
schismatic
thieving
tough-guy
transgressor
trickster
wererat
whoremonger