aegis

Wikipedia-the concept of doing something "under someone's aegis" now means doing something under the protection of a powerful, knowledgeable, or benevolent source. The word aegis is identified with protection by a strong force with its roots in Greek 

In Context: (Shutter Island)  "You find yourself under the aeigis of that exception. You will not be allowed to pass through this gate with your firearms."  pg 29