1) Quisling 
collaborationist A description of someone who commits treason by cooperating with enemy forces occupying one's country. As such it implies criminal deeds in the service of the occupying power, including complicity with the occupying power in murder, persecutions, pillage, and economic exploitation; as well as, participation in a puppet government.
quisling noun someone who collaborates with an enemy occupying force
a person who collaborates with an enemy; collaborator.