Terrorism has been round as a foremost nuisance to authorities as long as noted history. The Bible supports terror, assassination, and annihilation in some places. (Juergensmeyer 2000)
Discussion
Gurr's three kinds of terrorism are Vigilante terrorism, insurgent terrorism, transnational terrorism.
Vigilante terrorism
The reason of vigilantes is to fight back the rank quo or come back to the rank quo of an previous period. Insurgencies use terrorism to farther their political aspires (i.e. Chinese, Algerians in 1954-62, MORO, Communist Greeks, etc). Terrorist assemblies often use insurgency tactics. The achievement of both assemblies lay exactly with the public, if negative,neutral, or proactive support.