History of terrorism

The history of terrorism is a history of well-known and historically significant individuals, entities, and incidents associated, whether rightly or wrongly, with terrorism. Scholars agree that terrorism is a disputed term, and very few of those labeled terrorists describe themselves as such. It is common for opponents in a violent conflict to describe the other side as terrorists or as practicing terrorism.

Depending on how broadly the term is defined, the roots and practice of terrorism can be traced at least to the 1st-century AD Sicarii Zealots, though some dispute whether the group, which assassinated collaborators with Roman rule in the province of Judea, was in fact terrorist. The first use in English of the term 'terrorism' occurred during the French Revolution's Reign of Terror, when the Jacobins, who ruled the revolutionary state, employed violence, including mass executions by guillotine, to compel obedience to the state and intimidate regime enemies. The association of the term only with state violence and intimidation lasted until the mid-19th century, when it began to be associated with non-governmental groups. Anarchism, often in league with rising nationalism and anti-monarchism, was the most prominent ideology linked with terrorism. Near the end of the 19th century, anarchist groups or individuals committed assassinations of a Russian Tsar and a U.S. President.

In the 20th century, terrorism continued to be associated with a vast array of anarchist, socialist, fascist and nationalist groups, many of them engaged in 'third world' anti-colonial struggles. Some scholars also labeled as terrorist the systematic internal violence and intimidation practiced by states such as the Stalinist Soviet Union and Nazi Germany.

Though many have been proposed, there is no consensus definition of the term "terrorism." This in part derives from the fact that the term is politically and emotionally charged, "a word with intrinsically negative connotations that is generally applied to one's enemies and opponents." Listed below are some of the historically important understandings of terror and terrorism, and enacted but non-universal definitions of the term:

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