Explain the principles of the rule of law and constitutionalism and assess how they constrain government power in Australia

What this dot point is asking

The rule of law is one of the founding ideas of the Australian political and legal system, even though it is not written down as a single rule. SCSA wants you to understand it both as a principle and as something the system actually delivers (or fails to deliver) in practice.

The core principles

The classic statement comes from the British jurist A.V. Dicey, who described three ideas. First, no one can be punished except for a breach of established law proved in the ordinary courts, so government cannot act on arbitrary or discretionary power. Second, everyone is equal before the law, including officials and ministers, who are subject to the same law as ordinary citizens. Third, the rights of individuals are secured by the ordinary law as developed by the courts, rather than by abstract declarations.

Modern statements add further elements that you should be able to list: laws should be clear, known in advance and not retrospective; like cases should be treated alike; there must be access to independent and impartial courts; and there should be a fair hearing (natural justice). The rule of law is the reason a government cannot simply imprison a person it dislikes without charge or trial.

Constitutionalism and the supremacy of the Constitution

Constitutionalism is the related idea that government must operate within limits set by a constitution, and that those limits are legally enforceable. In Australia the Constitution is the supreme law: any Commonwealth or state law that exceeds constitutional power, or breaches an express or implied constitutional limit, is invalid. This is what makes the system one of limited government rather than unlimited parliamentary power.

The High Court enforces constitutionalism through judicial review. Because the Constitution sits above ordinary legislation and can only be altered by a section 128 referendum, Parliament cannot quietly expand its own powers. This is the structural backbone that turns the rule of law from an aspiration into an enforceable reality.

The Communist Party Case (1951)

The single best illustration is the Australian Communist Party v Commonwealth (1951). The Menzies government passed the Communist Party Dissolution Act 1950, which declared the party unlawful and allowed the executive to ban organisations and disqualify individuals largely on its own say-so. The High Court struck the Act down. It held the Commonwealth could not simply recite that something was a threat to defence in order to give itself power; the existence of constitutional power is a question for the courts, not a matter the Parliament can declare into being.

Justice Fullagar's reasoning captured the principle that the Constitution does not allow Parliament to be the judge of the limits of its own authority. The case is the textbook example of the rule of law and constitutionalism operating together to limit political power, and it is frequently cited in WACE answers as proof that the system can restrain even a popular government acting on national security grounds.

Strengths and weaknesses in practice

When you assess these principles, weigh both sides. Strengths include an independent judiciary with security of tenure, the supremacy of a written Constitution, equality before the law, and avenues such as judicial review and appeals. Weaknesses include the absence of a comprehensive bill of rights, the practical cost of accessing courts, the breadth of executive discretion in areas like immigration and national security, and the use of retrospective or broadly drafted legislation. A strong response uses a contemporary example, such as debate over indefinite immigration detention, to show the rule of law being tested.