terrorist act means an act including but not limited to the use or threatened use of force or violence against person or property, or commission of an act dangerous to human life or property, or commission of an act that interferes with or disrupts an electronic or communication system, undertaken by any person or group, whether or not acting on behalf of or in connection with any organization, government, power, authority or military force, when the effect is to intimidate or coerce a government, the civilian population or any segment thereof, or to disrupt any segment of the economy.