The recognition of individual rights entails the banishment of physical force from human relationships: basically, rights can be violated only by means of force. In a capitalist society, no man or group may initiate the use of physical force against others. The only function of the government, in such a society, is the task of protecting man’s rights, i.e., the task of protecting him from physical force; the government acts as the agent of man’s right of self-defense, and may use force only in retaliation and only against those who initiate its use; thus the government is the means of placing the retaliatory use of force under objective control.

- Ayn Rand. Capitalism: The Unknown Ideal (1966).