 Should we adopt a wide or a narrow definition? A wide definition encompasses the entire history of “terrorism” from the Jacobins to the present, and is more in accord with current ordinary use. A narrow definition departs from much ordinary use by restricting terrorist violence to that directed at non-combatants or innocent persons. Thus it leaves out most of 19th century “propaganda by the deed” and political violence perpetrated by Russian revolutionaries which they themselves and the public called terrorist.