What the Law Calls Terrorist Activity
September 11This thread follows the statute from specified violent acts to threats and conspiracies that can also qualify under the definition.
increasing
Bearing strength in each event
decreasing
Transport Sabotage

Transport Sabotage
Specified conduct
The definition includes hijacking or sabotage of transportation, including aircraft, ships, and vehicles.
Concrete examples
By naming familiar forms of transport, the statute sets out conduct that can qualify without relying on an abstract label alone.
Coercive Kidnapping

Coercive Kidnapping
Threats used as leverage
Kidnapping or detention qualifies when threats to kill, injure, or continue holding a person are used to compel a third party or government.
Conditional release
The demanded action or inaction is tied explicitly or implicitly to the captive's release.
Protected Persons and Murder

Protected Persons and Murder
International protection
Violent attacks on internationally protected persons, or violations of their liberty, are included.
Assassination
The statute separately names assassination, making lethal political violence a defined category of terrorist activity.
Weapons and Explosives

Weapons and Explosives
Dangerous means
The definition includes biological, chemical, and nuclear agents or devices, as well as explosives and firearms used with dangerous intent.
Intent and harm
The provision focuses on endangering people directly or indirectly or causing substantial property damage, with a stated exception for certain personal theft.
Threats and Conspiracies

Threats and Conspiracies
Beyond completed attacks
Threatening, attempting, or conspiring to commit the listed acts can also qualify.
Prevention in the legal frame
The definition reaches plans and preparatory conduct, not only violence that has already occurred.
At the beginning of the statutory definition
As the definition moves to hostage-taking
During the middle clauses of the definition
As the definition specifies methods of attack
At the close of the list of qualifying acts