Key Takeaways

Federal law defines domestic terrorism as violent acts intended to intimidate civilians or influence government policy, perpetrated within the US by domestic actors without foreign direction.
Right-wing extremism has been identified by the FBI and DHS as the largest domestic terrorism threat by number of incidents and fatalities in recent years.
There is no "domestic terrorist" criminal charge — the terrorism label is used for investigation and prosecution priority, not as a standalone offense.
The Trump administration has shifted the definition's application, including designating some antifa and left-wing groups while reducing focus on white nationalist threats.

AI Summary

Key takeaways highlight Federal law defines domestic terrorism as violent acts intended to intimidate civilians or influence government policy, perpetrated within the US by domestic actors without foreign direction. Right-wing extremism has been identified by the FBI and DHS as the largest domestic terrorism threat by number of incidents and fatalities in recent years. There is no "domestic terrorist" criminal charge — the terrorism label is used for investigation and prosecution priority, not as a standalone offense. The Trump administration has shifted the definition's application, including designating some antifa and left-wing groups while reducing focus on white nationalist threats.

Government

What Is Domestic Terrorism and How Does the US Define It?

May 18, 2026 · 3 min read

Domestic terrorism is a legal term with specific definitional requirements, a political term used to describe threats inconsistently across ideological lines, and a law enforcement priority whose application reveals a great deal about how the government perceives different types of political violence.

These three meanings don't always align.

The Legal Definition

Under 18 U.S.C. § 2331, domestic terrorism requires three elements:

Dangerous acts: Activities that violate federal or state criminal law
Political or coercive intent: The acts must "appear to be intended to intimidate or coerce a civilian population" or "influence the policy of a government by intimidation or coercion" or "affect the conduct of a government by mass destruction, assassination, or kidnapping"
Domestic jurisdiction: The acts occur primarily within the United States

Importantly: there is no federal crime called "domestic terrorism." It is a definitional category used to prioritize investigations and allocate resources, not a standalone criminal charge. Domestic terrorists are prosecuted for underlying crimes: murder, assault, bombing, seditious conspiracy.

The terrorism label triggers enhanced investigative tools, greater inter-agency coordination, and higher prosecution priority. But the sentence for murder is the same whether or not the FBI labels the crime domestic terrorism.

The Actual Threat Landscape

FBI and DHS threat assessments over the past decade have consistently found that racially motivated violent extremism — particularly white nationalist and white supremacist ideology — accounts for the largest share of domestic terrorism deaths.

Incidents like the 2015 Charleston church shooting (9 killed), 2018 Pittsburgh synagogue shooting (11 killed), 2019 El Paso shooting (23 killed), and the January 6, 2021 Capitol attack demonstrate the scope of far-right political violence.

Anti-government extremism — the militia movement, sovereign citizens, anti-government extremists — accounts for significant incidents including the 2016 Bundy standoff, various plot disruptions, and ongoing recruitment.

Left-wing domestic terrorism exists — the 2017 Congressional baseball shooting, periodic property destruction by radical environmental groups — but has historically caused fewer fatalities than right-wing terrorism in recent years according to FBI data.

The January 6 Question

The January 6, 2021 attack on the US Capitol remains the largest domestic terrorism incident by participant count in recent American history — over 1,000 participants identified, hundreds prosecuted, including seditious conspiracy charges for organizers.

Trump's pardon of virtually all January 6 defendants upon taking office in 2025 created a direct conflict between the legal classification of the events and the political response: if January 6 defendants are pardoned rather than imprisoned, what does the terrorism designation mean in practice for determining consequences?

The Definitional Politics

The Trump administration has redefined domestic terrorism priorities in practice:

Directed the DOJ and FBI to focus resources on "left-wing violence," antifa, and pro-Palestinian protest-related violence
Challenged threat assessments emphasizing right-wing terrorism
Reduced FBI resources dedicated to domestic terrorism involving white nationalist groups

Critics argue this is dangerously misaligned with the actual threat data. Supporters argue the prior administration overcounted right-wing threats and undercounted left-wing ones.

The underlying question is not primarily a factual dispute — the data on where the fatalities and attacks come from is documented. It is a political question about which threats the government chooses to prioritize, which communities it investigates, and who gets treated as a threat requiring enhanced law enforcement attention.

That question, in American politics, is never answered without reference to ideology. And the answer always reveals more about priorities than about the actual threat landscape.

FAQ

What is domestic terrorism in the United States?

Under 18 U.S.C. § 2331, domestic terrorism means acts that: (A) involve dangerous acts that violate federal or state criminal laws; (B) appear intended to intimidate or coerce a civilian population, influence government policy through coercion, or affect government conduct through mass destruction, assassination, or kidnapping; and (C) occur primarily within US jurisdiction. The definition requires violent or dangerous acts with political coercive intent — not mere political extremism or unpopular views.

What is the biggest domestic terrorism threat in the US?

FBI and DHS threat assessments from 2019-2023 consistently identified racially or ethnically motivated violent extremists (RMVE) — primarily white nationalist and white supremacist groups — as the most lethal domestic terrorism threat by fatalities. Anti-government extremism (militia movements, sovereign citizens) ranked second. Domestic Islamist-inspired attacks declined from peak levels. The Trump administration has challenged these threat assessments and redirected some resources.

Is antifa a terrorist organization?

Antifa ("anti-fascist") is not an organization — it is a loose decentralized movement with no formal membership, leadership, or structure. There is no group to designate. The Trump administration has repeatedly called for designating "antifa" as a terrorist organization, but DOJ lawyers have noted the legal impossibility of designating something that has no defined membership or structure. Individual antifa participants who commit violent crimes can be prosecuted for those crimes under existing law. The FBI does not list antifa as a terrorist organization.

What is the difference between a terrorist and a mass shooter?

Under US law, the distinction is primarily intent: mass shooters may commit acts of violence without the specific intent to coerce a civilian population or influence government policy. When a mass shooter's expressed motivation is racial, political, or ideological coercion — as in several recent attacks — they may be investigated as terrorists. The legal distinction matters primarily for investigative resources, prosecution strategy, and classification of the threat, not for the severity of charges available.