Collaborationism describes the treason of 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. Etymology The term collaborate dates from 1871, and's a back-formation from collaborator (1802), from the French collaborateur as used during the Napoleonic Wars against smugg… (More on Collaborationism)