Here's the FBI's definition:
Domestic Terrorism for the FBI’s purposes is referenced in U.S. Code at 18 U.S.C. 2331(5),
and is defined as activities:
• Involving acts dangerous to human life that are a violation of the criminal laws of the United
States or of any State;
• Appearing to be intended to:
o Intimidate or coerce a civilian population;
o Influence the policy of government by intimidation or coercion; or
o Affect the conduct of a government by mass destruction, assassination or kidnapping; and
• Occurring primarily within the territorial jurisdiction of the United States.
This is a definitional statute, not a charging statute. We talk about the threat these actors pose as
Domestic Terrorism threats, but each of the FBI's threat categories, described in further detail below,
uses the words “violent extremism” because the underlying ideology itself and the advocacy of such
beliefs is not prohibited by US law.
As required by the National Defense Authorization Act, the FBI and Department of Homeland Security, in consultation with the Director of National Intelligence, have developed standard definitions of terminology related to domestic terrorism and uniform methodologies for tracking domestic...
www.fbi.gov