Rule of Law
The Rule of Law is a fundamental conservative principle underlying the Magna Carta, the Declaration of Independence, the U.S. Constitution, and a political philosophy. In essence it entails that no person is above the rule of law, and that the law is to be applied equally to all. Some countries openly breach the rule of law (such as Zimbabwe with its denial of basic human rights). Others such as Australia and America promote the ideology of equality before the law, however there have been cases where this has not occurred (for example in Australia the Wood Royal Commission of 1995 found that police officers were not being properly investigated for cases of perjury, and hence were acting above the law).
As the government expands the rule of law contracts, because congress stops passing laws and starts passing sentiments ("we should have clean air", "we should have adequate schools", etc.) and handing the process of developing rules becomes the domain of the bureaucrat.