This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...nt fall into three broad categories, all of them involving the issues of physical force and the protection of men’s rights: the police, to protect men from criminals — the armed services, to protect men from foreign invaders — the law courts, to settle disputes among men according to objective laws.

These three categories involve many corollary and derivative issues
— and their implementation in practice, in the form of specific legislation, is enormously complex. It belongs to the field of a special science: the philosophy of law. Many errors and many d...
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