Thanks Brian. The word collusion comes to mind
/kəˈluʒən/ Show Spelled [kuh-loo-zhuhn] Show IPA
noun
1.
a secret agreement, especially for fraudulent or treacherous purposes; conspiracy: Some of his employees were acting in collusion to rob him.
2.
Law. a secret understanding between two or more persons to gain something illegally, to defraud another of his or her rights, or to appear as adversaries though in agreement