The Constitution is the supreme law of the land. Any law or act which is inconsistent with it has no force or effect. The effect of this provision is that laws and administrative acts must comply with the Constitution. The Constitution is binding on the executive branch of government in every sphere of administration. As a source of administrative law, the Constitution establishes a variety of agencies and administrative structures to control the exercise of public power.
South African administrative law is the branch of public law in that country which regulates the legal relations of public authorities, whether with private individuals and organisations or with other public authorities, or better say, in present-day South Africa, which regulates "the activities of bodies that exercise public powers or perform public functions, irrespective of whether those bodies are public authorities in a strict sense.
Tax law, the body of rules under which a public authority has a claim on taxpayers, requiring them to transfer to the authority part of their income or property. The power to impose taxes is generally recognized as a right of governments.
Criminal law, as distinguished from civil law, is a system of laws concerned with the punishment of individuals who commit crimes. Thus, where in a civil case two individuals dispute their rights, a criminal prosecution involves the government deciding whether to punish an individual for either an act or an omission.
Procedural law also governs the ways a person convicted of a crime may challenge their convictions. The source of procedural law includes the same sources of law you have just read about which govern substantive criminal law: the constitution, cases law or judicial opinions, statutes, and common law.