The police can use violence to say, expel citizens from a public park because they are enforcing duly constituted laws. Laws gain their legitimacy from the Constitution. The Constitution gains its legitimacy from something called 'the people.' But how did 'the people' actually grant legitimacy to the Constitution? As the American and French revolutions make clear: basically, through acts of illegal violence. So what gives the police the right to use force to suppress the very thing-a popular uprising-that granted them their right to use force to begin with?