Terrorism: Definitions, Justifications, and Organization

Definitions of Terrorism

Under the U.S. government, terrorism has several distinct definitions — and this is before accounting for the additional definitions proposed by academic scholars. In a study by Mark Burgess (2003) for the U.S. Center for Defense Information, he identified five definitions of terrorism: three from the U.S. government and two from academic scholars. According to Burgess, the common factors across each definition are the terrorists' motives, identity, and methods.

The Department of Defense defines terrorism as "[t]he calculated use of unlawful violence to inculcate fear… to intimidate governments or societies in the pursuit of goals that are generally political, religious or ideological" (para. 4). The FBI uses a similar definition, though worded differently, and extends the object of violence to include not only people but also property. The State Department offers a more specific definition, identifying terrorism as "premeditated" and primarily "politically motivated," and characterizes terrorists as "subnational groups or clandestine agents." Academic scholars have defined terrorism in complementary ways: as (i) the "deliberate evocation of dread" and (ii) a phenomenon in which "terrorists' concerns are macroconcerns about changing a larger order…" (para. 9, 12).

Among these definitions, the Department of Defense's formulation best captures a broadly applicable definition of terrorism. However, current literature and ongoing debates argue that terrorism cannot be defined with full precision, since the concept is highly dependent on the worldview of those attempting to understand or discuss it. As Burgess noted, most of the definitions presented reflect a Western worldview. The construct of "terrorism," he countered, would look quite different — and carry a different definition — when understood from the perspective of the societies from which terrorists have purportedly come.

Terrorists' Justification of Their Actions

Current events and debates surrounding terrorism have created a scenario in which both terrorists and governments invoke the "just war" justification for committing violent acts against noncombatant and civilian groups. One theoretical framework that captures this dynamic is the just-war theory, which is used to explain warfare and violent acts committed against terrorist groups by governments. Michael Walzer, the theory's major proponent, discusses how war and even torture are justified by governments "retaliating" against terrorist groups (Slater, 2006, p. 198):

When our deepest values are radically at risk, the constraints lose their grip, and a certain kind of utilitarianism reimposes itself. I call this the utilitarianism of extremity, and I set it against a rights normality… No government can put the life of the community itself and of all its members at risk, so long as there are actions available to it, even immoral actions, that would avoid or reduce the risk.

The theory's argument that "the end justifies the means" can be used, conversely, by terrorist groups themselves — with their fellow nationals and allied groups serving as the "community" they intend to fight for and protect. Inevitably, the question of justified action against terrorist groups and governments has become a moral gray area, as the just-war theory itself makes plain.

Structure and Organization of Terror Groups

The U.S. Army Training and Doctrine Command (USA TRADOC, 2007) developed a document that provides thorough detail on how terror groups are structured and organized. Generally, terror groups are structured either as hierarchies or as networks. Hierarchical structures are highly dependent on members' ideological commitment, while networks are characterized by variety and complexity. Networks can be further subdivided into cells taking one of several forms: a chain organization (reactive, sequential movement of members), an all-channel organization (lateral connections among all members), or a star/hub organization (a central individual who serves as the primary point of contact). In practice, however, terror groups often use hybrids of these organizational models, making the hybrid the most difficult to identify, track, and trace.

Conclusion

Taken together, these perspectives reveal that terrorism is not a monolithic phenomenon but one deeply shaped by cultural, political, and socioeconomic contexts that resist any single universal definition. Competing definitions — whether from U.S. government agencies or academic scholars — each capture part of the reality but none captures all of it, largely because the concept is inherently perspective-dependent. The just-war framework shows that moral justifications for political violence are contested and can be wielded by multiple parties. Organizational analysis demonstrates that terror groups are adaptive and structurally diverse. And the historical roots traced through Huntington, Barnett, and 19th-century anarchist and socialist movements confirm that terrorism is ultimately a product of unresolved social, cultural, and economic tensions — understanding which remains essential to any serious effort to address it.

References

Burgess, M. (2003). Terrorism: the problems of definition. Center for Defense Information. Accessed 23 April 2011. Available at: http://www.cdi.org/program/issue/document.cfm?DocumentID=1564&IssueID=138&StartRow=1&ListRows=10&appendURL=&Orderby=DateLastUpdated&ProgramID=39&issueID=138

Slater, J. (2006). Tragic choices in the war on terrorism: should we try to regulate and control torture? Political Science Quarterly, 121(2).

US Army Training and Doctrine Command. (2007). Terrorist organizational models. In A Military Guide to Terrorism in the Twenty-First Century. Available at: www.fas.org/irp/threat/terrorism/guide.pdf