betrayal
breaking or violation of a presumptive contract, trust, or confidence
defection
giving up of allegiance to one state for allegiance to another in a manner considered illegitimate by the first state
treason
crime that covers some of the more extreme acts against one's sovereign or nation
Bargain of Judas
biblical episode
betrayal of secrets
form of betrayal
race traitor
Pejorative term used by racists
perfidy
breaking of promise of good faith in order to gain military advantage