defection
noun
[ dɪˈfɛkʃn ]
• the desertion of one's country or cause in favour of an opposing one.
• "the very public defections of four writers from the publishing house"
Similar:
desertion,
absconding,
decamping,
flight,
changing sides/allegiances,
apostasy,
recantation,
secession,
treason,
betrayal,
disloyalty,
rebellion,
mutiny,
perfidy,
tergiversation,
recreancy,