Benedict Arnold
Brutus
Judas
Judas Iscariot
Machiavellian
Quisling
abettor
accessory
accomplice
archtraitor
betrayer
cockatrice
coconspirator
conniver
conspirer
counterplotter
double agent
double-crosser
double-dealer
exploiter
finagler
informer
intrigant
intriguer
machinator
maneuverer
operator
opportunist
plotter
quisling
rat
schemer
serpent
snake
timeserver
traitor
treasonist
trimmer
turncoat
wire-puller
criminal
crook
felon
malefactor
outlaw
Fawkes
Oates
guy fawkes
titus oates
adventurer
assassin
bandit
conspiracy
courtier
liar
murderer
offender
patriot
rebel
robber
ruffian
scoundrel
smuggler
spy
thug
tyrant
villain