“Obedience is at the heart of political power,” he wrote. “Rulers or other command systems, despite appearances, [are] dependent on the population’s goodwill, decisions, and support.” Sharp’s idea was straightforward: if people refuse to cooperate with a regime—if civil servants stop carrying out the functions of the state, if merchants suspend economic activity, if soldiers stop obeying orders—even an entrenched dictator will find himself handicapped.

