Legal Analysis Hypothetical: One Nation Wins. Albanese Bans It and Jails the Lot. Then What?

Start with the premise, not the sermon. This is a hypothetical, a constitutional thought experiment, not something the Albanese government has proposed: just yet! Suppose One Nation surges at a federal election. Polls, preferences, a fractured Coalition and an extraordinary campaign carry Pauline Hanson's party to enough seats to command the House of Representatives, either alone or with reliable support. The voters have spoken. One Nation has won the democratic contest, but the constitutional transition has not yet been completed. Anthony Albanese remains Prime Minister while the Governor-General has yet to commission his successor.

Now make the hypothetical extreme. The outgoing government uses that interval to suppress the victorious party. Parliament has passed, or somehow passes, legislation under which One Nation is declared unlawful, membership becomes a criminal offence, and its parliamentarians and senior officials are arrested. The politicians whom Australians have just elected to form the next government are placed in custody before they can take executive office. What happens then?

This is not an argument about whether One Nation's policies are good or bad, or whether Pauline Hanson ought to be Prime Minister. It is a machine-check on Australian constitutional government. Australia has a written Constitution, a High Court that famously invalidated Commonwealth legislation dissolving the Communist Party in 1951, an implied freedom of political communication, and constitutional requirements that senators and members of the House of Representatives be "directly chosen by the people." Remarkably, the High Court also presently has before it a case testing constitutional objections to Commonwealth legislation capable of making membership of a specified organisation criminal.

The contemporary case is White Australia Party Inc v Commonwealth, M50/2026. Under the Combatting Antisemitism, Hate and Extremism (Criminal and Migration Laws) Act 2026, the Commonwealth created a regime under which organisations can be specified as "prohibited hate groups." The White Australia organisation was subsequently specified, with serious consequences including criminal liability for membership or certain other forms of involvement. White Australia and another plaintiff went directly to the High Court, contending, according to the Court's description of the proceeding, that Part 5.3B of the Criminal Code is invalid on grounds including want of legislative power, the implied freedom of political communication and Chapter III of the Constitution. The Full Court heard the matter on 8 and 9 September 2026 and, at the time of writing, judgment has not been delivered.

That litigation does not establish that Parliament can never prohibit a political organisation, nor does it establish that Parliament may do so whenever it chooses. Those constitutional questions are precisely why the case matters. It nevertheless makes our hypothetical considerably less science-fictional as a problem of constitutional law. Australia now has Commonwealth legislation capable of making membership of a specified organisation criminal, while the High Court is considering constitutional objections to that regime. There remains, however, an enormous difference between legislation defended as directed against hate and extremism and our hypothetical outgoing government using criminal law against an otherwise lawful registered political party because that party has just defeated it at an election.

The historical starting point would inevitably be Australian Communist Party v Commonwealth, the Communist Party Case. The Menzies government enacted the Communist Party Dissolution Act 1950, which dissolved the Australian Communist Party and created machinery directed against associated organisations and persons. The High Court struck the legislation down. That decision should not be reduced to a simplistic proposition that the Constitution contains an unwritten command that political parties can never be banned. Its reasoning concerned the limits of Commonwealth legislative power and, importantly, Parliament's inability effectively to manufacture the constitutional facts necessary to support its own exercise of power merely by declaring those facts to exist.

Nevertheless, its relevance to this hypothetical is impossible to miss. A Commonwealth government has previously attempted to destroy a political organisation by legislation, and the High Court did not accept that Parliament's declaration of danger was sufficient to establish the constitutional validity of what Parliament had done. An outgoing government attempting to suppress the political organisation that had just defeated it would therefore enter the High Court carrying seventy-five years of constitutional baggage.

There is also a body of constitutional law that did not exist in its modern form in 1951. Sections 7 and 24 of the Constitution require senators and members of the House respectively to be "directly chosen by the people." From the constitutional structure of representative and responsible government the High Court has also derived the implied freedom of communication concerning political and governmental matters. That freedom is not an American-style personal right to free speech. It operates as a constitutional restriction upon legislative and executive power where government action impermissibly burdens the political communication required by Australia's constitutionally prescribed system of government.

In the post-election version of our hypothetical, those principles become especially important because the electorate has already done what the Constitution contemplates: it has chosen its representatives. Those representatives have produced a parliamentary majority capable of supporting a government. The outgoing executive then invokes criminal law to prevent those representatives from taking executive office because of their membership of the political organisation through which the electorate chose them. The constitutional question becomes stark: what does "directly chosen by the people" amount to if the defeated government can prevent the people's electoral choice from taking governmental effect by imprisoning the victorious political grouping?

Sections 7 and 24 would not necessarily supply a simple mechanical answer by themselves. Australian constitutional doctrine is considerably more complicated than that. But any litigation would occur against the background of the High Court's jurisprudence concerning representative government, electoral choice and the implied freedom of political communication, with the Communist Party Case looming over the entire dispute.

Recent decisions also show why the argument must not be pitched too broadly. In Ruddick v Commonwealth in 2022, the High Court upheld legislation regulating political-party names and logos where names could confuse voters. Regulation of political parties is therefore not inherently unconstitutional. Then came Babet v Commonwealth in 2025. The United Australia Party had voluntarily deregistered following the 2022 election and subsequently sought to register again before the 2025 election. Commonwealth electoral law prevented its re-registration until after the next general election. Senator Ralph Babet and Clive Palmer challenged that restriction using constitutional considerations relevant to our hypothetical, including sections 7 and 24, electoral choice and the implied freedom of political communication. They lost, with the High Court unanimously upholding the provision.

That result makes our hypothetical sharper rather than weaker. There is a profound difference between telling a political party that, having voluntarily deregistered, it must comply with a generally applicable re-registration regime serving electoral and disclosure purposes, and telling a party that has just won enough parliamentary seats to govern that the organisation is illegal and its elected members may be arrested. One concerns electoral machinery and regulation; the other would strike directly at the political contest and, in the post-election scenario, at the implementation of the electoral result itself.

Nor is electoral deregistration equivalent to prohibition. A Prime Minister cannot simply walk to a lectern and announce that a registered political party has ceased to exist. Party registration is administered under legislation by the Australian Electoral Commission. Deregistration affects electoral status, including matters such as the appearance of a party's name and logo on ballot papers. It is not the same thing as declaring membership of the organisation criminal. Our hypothetical therefore requires something much more dramatic: legislation, or reliance upon an existing statutory regime, capable of suppressing the organisation and criminalising relevant involvement with it.

This is where the pending White Australia Party litigation becomes particularly interesting. The High Court is considering constitutional objections to a statutory regime that does criminalise membership of a specified organisation. Its eventual judgment may tell us considerably more about the limits of Commonwealth power where organisational prohibition collides with political communication and other constitutional restrictions. But even a Commonwealth victory in that case would not automatically establish that an outgoing government could criminalise an incoming government. Constitutional validity depends upon the particular legislation, the constitutional powers supporting it, its operation and the burdens it imposes. Upholding legislation directed at an organisation specified under a statutory hate-and-extremism regime would not necessarily confer constitutional permission upon a government to outlaw a mainstream electoral opponent because that opponent had won an election.

The timing of our hypothetical also brings the caretaker conventions into the picture. Australia's Constitution does not say that the winner of an election automatically becomes Prime Minister. Section 64 gives the Governor-General the formal power to appoint ministers, while constitutional convention ordinarily supplies the decisive political fact: the person capable of commanding the confidence of the House is commissioned to form government. During the transition, the outgoing Prime Minister may therefore remain formally in office even though the election has deprived his government of its political mandate.

Caretaker conventions exist precisely because electoral authority can change before every constitutional and administrative formality associated with the transition has been completed. An outgoing government is expected to avoid major decisions binding its successor during the caretaker period. Arresting the leadership of the victorious political grouping so that it cannot form the government would plainly be no ordinary exercise of caretaker administration. Yet conventions are not statutes. A breach of convention does not automatically invalidate legislation, release a prisoner or determine a constitutional case. That is why the crisis would move immediately from political convention to constitutional law.

The first battlefield would therefore almost certainly be the courts rather than the streets. Lawyers acting for the party, its candidates and arrested members could seek urgent relief and challenge the validity or operation of the legislation. The challengers would invoke the Communist Party Case, sections 7 and 24, the implied-freedom jurisprudence, Ruddick, Babet, and perhaps by then the High Court's decision in White Australia Party. The Commonwealth would have to establish the constitutional foundation of the legislation and defend its application to an organisation whose parliamentary candidates had just persuaded enough Australians to form the government.

Interlocutory relief could become almost as important as the ultimate judgment. If enforcement were temporarily restrained, the incoming parliamentary majority might be able to assemble, demonstrate confidence and proceed through the ordinary constitutional transition while the validity of the legislation was litigated. If relief were refused, Australia would enter much stranger territory, because arrest does not necessarily extinguish parliamentary membership.

The Constitution separately regulates qualifications, disqualifications and vacancies. Party membership and membership of Parliament are not identical legal things, and merely arresting an elected representative does not necessarily make that representative's parliamentary seat evaporate. An outgoing government therefore could not necessarily manufacture a new parliamentary majority merely by putting members of the incoming majority into police vans. If an election returned, for example, 80 members supporting the incoming government and 70 supporting the outgoing government and others, arresting the 80 would not magically transform the 70 into the parliamentary majority chosen by the electorate.

That would produce the central constitutional absurdity of the scenario. Albanese might remain formally Prime Minister until another government was commissioned, yet politically he would be the defeated Prime Minister governing while the parliamentary majority chosen to replace him remained in custody. Responsible government ultimately depends upon parliamentary numbers. Handcuffs do not alter arithmetic. They can prevent elected representatives from physically giving effect to those numbers, but they do not retrospectively change how Australians voted.

Government House would consequently become part of the crisis, although the Governor-General would not become an alternative constitutional court. Determining the validity of Commonwealth legislation is a judicial function. Nor does the Governor-General possess some general authority to disregard Acts of Parliament or release prisoners because their detention has produced an extraordinary political situation. The vice-regal office does, however, have the constitutional function of appointing ministers and commissioning the Prime Minister.

Suppose Pauline Hanson could demonstrate that she commanded the confidence of the newly elected House but was under arrest solely because membership of One Nation had been criminalised. Could another member of the victorious parliamentary grouping be commissioned? What if every plausible minister from that grouping had been arrested under the same law? Could the defeated Prime Minister remain in office indefinitely because the people capable of replacing him had been incapacitated through criminal proceedings? These would be extraordinarily difficult questions because the Crown would be confronted with an outgoing ministry that had lost the election but remained in office because the incoming political leadership had been prevented from taking office.

The Governor-General's task would not be to decide which political party deserved to govern. The constitutional problem would be how the machinery of responsible government could continue where the parliamentary grouping capable of commanding the new House had been prevented from assuming executive office. At the same time, the High Court would be dealing with litigation whose practical consequences could determine who actually governed Australia. The legal and political dimensions of the crisis could no longer be neatly separated.

This is what makes the post-election version of the hypothetical more constitutionally acute than a pre-election prohibition. Before an election, the argument concerns whether electors have improperly been denied a political option. After the election, the electorate's choice is known. The state is no longer merely restricting the range of choices available to voters; it is preventing an electoral choice already made from taking its ordinary parliamentary and governmental effect.

Suppressing the organisation would not make the political movement itself disappear either. A political party consists of more than a registered name. It consists of candidates, members, organisers, donors, policies and, most importantly, voters. Political opinions do not cease to exist when an organisation is prohibited. Supporters might seek other lawful organisational forms, candidates might operate independently where legally possible, and political communication would continue through meetings, broadcasting, social media and informal networks. That reality matters because Australia's constitutional system ultimately concerns electors choosing representatives, not merely organisations possessing registered names and logos.

There is no need to turn this hypothetical into fantasies about militias, insurrection or people marching on Canberra. The constitutional crisis is already severe enough. Peaceful demonstrations would be unsurprising, including perhaps demonstrations by Australians who strongly opposed One Nation but also opposed the use of criminal law to prevent an election result from taking effect. Police enforcing legislation would inevitably find themselves operating in an intensely political atmosphere, while the courts confronted urgent questions about the validity and operation of the law.

The High Court would not be deciding whether it approved of Pauline Hanson, One Nation or the Albanese government. It would be deciding the legal questions properly brought before it: whether the Commonwealth possessed the constitutional power to enact the legislation, whether the legislation infringed applicable constitutional limitations, and whether the particular statutory machinery could lawfully operate in the circumstances before the Court. The Communist Party Case would provide unavoidable historical and constitutional background; sections 7 and 24 would place electoral choice squarely in the constitutional frame; the implied freedom would raise questions about burdens upon political communication; and Ruddick and Babet would demonstrate that Parliament nevertheless possesses substantial authority to regulate parties and electoral machinery. Depending upon its reasoning, White Australia Party may add another important piece to that constitutional picture.

Those authorities point towards distinctions rather than slogans. Australian constitutional law permits substantial regulation of political organisations and electoral machinery. It does not follow from that proposition alone that a Commonwealth government possesses an unlimited capacity to eliminate an electoral competitor, still less that an outgoing government could use criminal prohibition to prevent a newly elected parliamentary majority from taking office.

Our hypothetical therefore ends somewhere very different from where it began. One Nation has already won enough parliamentary support to form a government. The question is no longer whether Australians should be permitted to vote for Pauline Hanson and her party. They have already voted. The question becomes whether a defeated Commonwealth government can use criminal law to prevent the people's electoral decision from producing the government that decision would ordinarily support under the system of responsible government.

That is the real machine-check. A democracy is not tested only by whether citizens are permitted to put marks on ballot papers. It is also tested by whether those marks are permitted to have constitutional consequences. If a government that loses an election could imprison the political grouping that wins before the Governor-General commissions the new ministry, the ballot would not technically have been abolished. Something more fundamental would have happened: the people would have been permitted to choose their representatives, but the machinery of the state would have prevented that choice from taking effect.

The deepest question, therefore, is not whether Pauline Hanson should become Prime Minister, whether Anthony Albanese should remain Prime Minister, or whether anybody approves of either party's policies. It is how far an Australian government can use law against an organised political movement before regulation of democratic politics becomes obstruction of the democratic choice from which Parliament itself derives its authority. In 1951 the High Court confronted one version of the constitutional problem created when Commonwealth power was used to suppress a political organisation. Seventy-five years later, White Australia Party v Commonwealth is testing another part of the boundary. Our hypothetical takes the problem to its most extreme electoral form: the voters have chosen, the government has lost, and the state is then used to prevent the choice from becoming government.