collaborationist
adjective politics, military disapproving uk/kəˌlæb.əˈreɪ.ʃən.ɪst/ us/kəˌlæb.əˈreɪ.ʃən.ɪst/
通敌叛国的，勾结敌人的
A collaborationist person or group works with an enemy who has taken control of their country.
a collaborationist government 卖国政府