Terrorism
Terrorism is, in the broadest sense, the use of intentionally indiscriminate violence as a means to create terror among masses of people; or fear to achieve a religious or political aim. It is used in this regard primarily to refer to violence during peacetime or in war against non-combatants. The terms "terrorist" and "terrorism" originated during the French Revolution of the late 18th century but gained mainstream popularity during the U.S. presidency of Ronald Reagan (1981–89) after the 1983 Beirut barracks bombings and again after the 2001 September 11 attacks and the 2002 Bali bombings.
Subversion
Offensive terror can be defined as the killing of people, destruction of property, kidnapping, etc. It is usually a minor part of subversion and, "is used not to exert force in the transfer of state power, but is meant to cower the people or ruler". Force used in this manner is meant to reinforce other forms or persuasion in addition to cowering the people or leaders. Additionally, much like civil unrest and agitation, it raises the question of whether or not the state can provide security for the population. Terror also provides a practical motivation of physically removing political opponents. The assassination of an organization's leader may open the door to a successor that is more friendly to the subversives position or possibly someone that has successfully infiltrated the organization and is in fact one of the subversives.