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President Trump has stated that he plans to label the anti-fascist network as a “significant extremist group” as within his initiatives to target the “radical left”, after the death of right-wing figure Charlie Kirk.

In a post on his Truth Social account, Trump referred to the movement a “hazardous, extreme left-wing threat” and vowed that the group would be “thoroughly investigated”.

Antifa—a loosely organized, leftist movement that opposes far-right, bigoted and authoritarian groups—has consistently attracted Trump’s ire.

But analysts have questioned how the administration will actually target the ideology, which does not have a clear central figure, roster or hierarchy. Previously, then-FBI Director Christopher Wray informed Congress that Antifa was more accurately described as an ideology than a structured entity.

The movement has remained a popular touchstone for some right-wing influencers and officials who argue that it is a integral part of a left-wing network they claim is attempting to undermine the US, expression rights and gun rights.

What does Antifa stand for?

Antifa is short for anti-fascist. It is a loose, non-hierarchical affiliation of mostly far-left supporters.

The name Antifa comes from the European word “antifaschistisch”, a reference to a German resistance group from the 1930s.

While Antifa’s presence in the US traces back many years, it rose to prominence after Trump’s 2016 win and the right-wing gathering in Charlottesville in 2017, where multiple anti-fascist groups started to come together.

Since then, individuals associating with Antifa have frequently clashed with right-wing groups, both in online debates and in physical altercations across the US.

Absence of a centralised structure means that Antifa cells tend to emerge spontaneously, both online and offline, and its members encompass anti-authoritarians, socialists and hardline socialists who broadly share skeptical, anti-capitalist, LGBTQ-supportive, and pro-immigration perspectives.

However Antifa is sometimes used as a catch-all term by right-leaning leaders and pundits to include other liberal and left-wing groups that they politically object to.

Is Antifa engage in violence?

Critics say what sets Antifa apart from mainstream left-wing movements is the willingness of some of its followers to use violence to advance their cause, which they in turn claim is in self-defence.

Activists often dress in black outfits and cover their faces in demonstrations. Online videos viewed depict some carrying clubs, barriers, poles and pepper spray at rallies.

In 2017, around a hundred masked activists displaying Antifa-linked banners and flags attacked a contingent of conservative protesters in Berkeley, resulting in several detentions.

Amid the protests that erupted in the US after the death of George Floyd in recent memory, a self-proclaimed Antifa activist, 48-year-old Michael Reinoehl, fatally wounded a member of a far-right group, a Portland-area right-wing organization. Reinoehl was subsequently shot dead by police.

Activist individuals also frequently release the identities and personal details of those that they consider to be extremist activists. The method—commonly known as “exposing”—aims to have people fired from their employment and otherwise socially ostracised.

In the wake of Charlie Kirk’s killing, posts from some self-identified Antifa members—on Reddit and X—defending the shooting have been observed.

Does Trump use the authority to designate Antifa a extremist group?

Trump has not specified how he intends to go about classifying Antifa as a terrorist organisation.

The US government can list a organization as a international extremist group—its “legal criteria” for this states that the targeted entity “has to be a foreign organization”.

An FTO label means members of a organization can be banned from the US or deported from the country and gives the administration the authority to seize financial support and penalize supporters.

However it is unclear how such measures could be applied to Antifa.

“I am unaware of any statutory provision I'm aware of that would officially recognize any group as a homegrown extremist group”, an analyst, a research fellow at George Washington University’s Program on Extremism, stated.

“As far as I know it’s just a proclamation on social media which lacks legal force, and if Congress wants to take concrete steps I doubt that occurring,” he said.

Additional jurists noted that First Amendment rights under the US constitution could restrict Trump’s capacity to implement the designation.

Academic David Schanzer, director of the Triangle Center on Terrorism and Homeland Security at Duke University, said: “The First Amendment protects the freedom to assemble, which encompasses the ability of individuals to organize and restricts the state from disrupting the activities of those groups, except of course, they have violated the law.”

“An executive designation of this group as a ‘major terrorist organisation’ does not change those fundamental legal protections,” he added.

Brad Evans—scholar specializing in conflict at Bath University—warned that Antifa’s absence of an formal framework and roster “provides a remarkable chance to extend the government’s authority and target anybody who may be suspected to belong with an organisation that is vague”.

“Consequently any individual believed to associating with Antifa, would need to refute their connection. Risks of excessive measures are all too apparent.”

Other legal experts have raised questions about why the federal government cannot challenge Antifa under current laws covering offenses like provoking unrest.

Why is the Trump administration targeting Antifa?

It is not new that Trump has criticized Antifa—he said he would designate the movement a terrorist organisation in previously but did not follow through on this at the time.

His latest statement is part of a broader effort against the “radical left” following the Charlie Kirk killing, with the leader asserting that: “Extremist activism has hurt numerous innocent people and claimed too many lives.”

The authorities have said that Tyler Robinson—the suspect in Kirk’s murder—had a “leftist ideology” but have not provided much detail and he has not been tied to Antifa.

How do research say about ideologically motivated unrest in the US?

This week, the US Justice Department removed a report into political violence in America which found that far-right radicalism exceeded “all other types of violent extremism