conniver (?.)
- Brutus
- Judas
- Judas Iscariot
- Machiavellian
- Quisling
- archtraitor
- betrayer
- cockatrice
- coconspirator
- conspirator
- 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
