Judas Iscariot, Lee Harvey Oswald, Sirhan, James Earl Ray?

Sicarii (Latin plural of Sicarius 'dagger-men' or later contract-killer, Hebrew ????????) is a term applied, in the decades immediately preceding the destruction of Jerusalem in 70 AD, (probably) to an extremist splinter group[1] of the Jewish Zealots, who attempted to expel the Romans and their partisans from Judea using concealed daggers (sicae).[2]  "When Albinus reached the city of Jerusalem,[3] he bent every effort and made every provision to ensure peace in the land by exterminating most of the Sicarii."

—Josephus, Jewish Antiquities (xx.208)

The Sicarii used stealth tactics to obtain their objective. Under their cloaks they concealed sicae, or small daggers, from which they received their name. At popular assemblies, particularly during the pilgrimage to the Temple Mount, they stabbed their enemies (Romans or Roman sympathizers, Herodians, and wealthy Jews comfortable with Roman rule), lamenting ostentatiously after the deed to blend into the crowd to escape detection. Literally, Sicarii meant "dagger-men".[4]

The victims of the Sicarii included Jonathan the High Priest, though it is possible that his murder was orchestrated by the Roman governor Felix. Some of their murders were met with severe retaliation by the Romans on the entire Jewish population of the country. On some occasions, they could be bribed to spare their intended victims. Once, Josephus relates, after kidnapping the secretary of Eleazar, governor of the Temple precincts, they agreed to release him in exchange for the release of ten of their captured comrades.