A major constitutional debate is unfolding in Australia after a leading legal scholar warned that new legislation allowing the government to ban “prohibited hate groups” could potentially be used against political parties, raising concerns about executive power, free speech, and democratic safeguards.

The warning comes as the High Court of Australia prepares to hear a landmark challenge against the law brought by the White Australia Party and former members represented in court filings.

At the center of the controversy is whether the legislation grants too much discretion to government ministers in determining what constitutes a “hate crime” and which organisations can be banned.

Legal expert Dr Anne Twomey, Professor Emerita in Constitutional Law at the University of Sydney, has become a key voice in the public debate.

In a detailed 19-minute video published on her Constitutional Clarion YouTube channel, she explained how the law operates and why it may raise constitutional concerns.

Her analysis has sparked significant discussion among legal observers, policymakers, and civil liberties advocates.

Dr Twomey argues that under the legislation, organisations can be banned based on conduct attributed to members, including informal or “rogue” actors.

She further notes that such conduct does not need to have resulted in a criminal conviction.

Instead, it is sufficient for the responsible minister to be “reasonably satisfied” that the group has engaged in or been associated with so-called “hate crimes.”

This, she suggests, shifts significant power away from courts and toward the executive branch.

According to her explanation, there is no requirement for independent judicial confirmation before a group is designated as a prohibited organisation.

She also highlighted that alleged conduct could be considered regardless of when it occurred, even if it took place before such actions were formally criminalised.

That aspect of the law, she warned, could have far-reaching implications for political organisations with long histories or evolving membership bases.

Dr Twomey stated that past political rhetoric relating to immigration, race, and social policy could potentially be used to justify a ban.

In her view, this creates a legal threshold that may be relatively easy for a future government to satisfy.

She described this as potentially making the legislation a “very dangerous weapon” in the hands of an authoritarian administration.

The debate has intensified political tensions, particularly among parties already critical of expanding hate speech and public order laws.

One Nation leader Pauline Hanson has previously voiced concern that similar laws could be applied to her party in the future.

She has argued that such measures risk being used selectively against political opponents.

Hanson has also pledged to seek repeal of hate speech-related legislation, claiming it could undermine free political expression.

However, she has not directly commented on the current High Court case involving the White Australia Party.

The legislation also requires the minister to be satisfied that banning a group is “reasonably necessary” to protect the public from harm.

This harm is defined broadly in the law to include social, economic, psychological, and physical harm.

Dr Twomey questioned whether such definitions could be interpreted too widely in practice.

She suggested that “psychological harm” in particular may be difficult to define with precision.

The legislation even states that psychological harm may include harm caused by the continued presence in Australia of a group deemed harmful.

This, she argued, could create a circular or “self-fulfilling” justification for banning organisations.

If a group is deemed harmful, and its continued existence is itself considered harmful, she warned that the threshold for intervention becomes easier to meet.

Such provisions, critics argue, risk blurring the line between public safety regulation and political suppression.

The White Australia Party, which was banned on May 15, is now challenging the law in the High Court.

The case also involves Thomas Sewell and approximately 1,788 former members who are contesting the legality of the ban.

Court filings argue that the legislation effectively allows the executive government to suppress political opponents without sufficient judicial oversight.

They claim the law operates as a “doorway to tyranny,” enabling the state to label and restrict political groups based on ideological grounds.

The High Court has accepted the case, marking a significant step in the constitutional review process.

An interlocutory hearing is scheduled for early June, where the court will consider whether temporary protections should be granted while the case proceeds.

The full constitutional arguments are expected to be heard in September.

Legal experts say the case could become one of the most important tests of executive power and political freedom in Australia in recent years.

One key issue before the court is whether the law violates the implied freedom of political communication.

Australia does not have an explicit constitutional bill of rights, but the High Court has previously recognised limited implied protections.

Dr Twomey suggested that the law’s broad language and discretionary powers may create disproportionate limits on political expression.

She argued that narrower legislative drafting could potentially achieve similar policy goals without restricting democratic debate so heavily.

The government, however, is expected to argue that the law is necessary to prevent harm and protect public order.

Supporters of the legislation say it is designed to address real risks posed by extremist organisations.

They argue that executive discretion is necessary in urgent or complex national security contexts.

The case also raises historical comparisons with the 1951 Communist Party Case, one of Australia’s most significant constitutional rulings.

In that landmark decision, the High Court struck down legislation attempting to ban the Communist Party on constitutional grounds.

Legal analysts say the current case may force the court to revisit similar questions about the limits of executive power.

Observers note that the outcome could set a precedent affecting how future governments regulate political organisations.

Civil liberties groups are closely watching the proceedings, warning that broad anti-extremism laws must be carefully constrained.

At the same time, national security advocates argue that modern threats require flexible legal tools.

The debate reflects a broader global tension between security policy and political freedom.

Similar legal discussions are occurring in other democracies over how to define extremism without undermining democratic rights.

As the case moves forward, attention is expected to intensify on both the legal reasoning and the political implications.

For now, Australia stands at the center of a major constitutional test that could reshape the boundaries between executive authority and political expression for years to come.