Benedict Arnold
Brutus
Judas Iscariot
Quisling
archtraitor
betrayer
cockatrice
conniver
conspirator
conspirer
convict
criminal
crook
deceiver
desperado
desperate criminal
double agent
double-crosser
double-dealer
felon
fugitive
gallows bird
gangster
gaolbird
informer
intrigant
intriguer
jailbird
lawbreaker
machinator
mobster
outlaw
plotter
public enemy
quisling
racketeer
rat
schemer
scofflaw
serpent
snake
swindler
thief
thug
timeserver
traitor
treasonist
trimmer
turncoat
two-timer
apostle
eyehole
peephole
saint
spyhole