Person who cooperates with an enemy?

A person who cooperates with an enemy is often referred to as a collaborator. This collaboration can occur in various contexts, such as during wartime, where individuals may assist opposing forces for personal gain or out of coercion. Collaborators may face significant moral and ethical dilemmas, and their actions can lead to social stigma or punishment from their own community. The term often carries a negative connotation, implying betrayal or treachery.