Sicarii - Wikipedia
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The Sicarii (Modern Hebrew: סיקריים siqariyim) were a splinter group of the Jewish Zealots who, in the decades preceding Jerusalem's destruction in 70 CE, strongly opposed the Roman occupation of Judea and attempted to expel them and their sympathizers from the area.
The Sicarii carried sicae, or small daggers, concealed in their cloaks. At public gatherings, they pulled out these daggers to attack Romans and alleged Roman sympathizers alike, blending into the crowd after the deed to escape detection.
The Sicarii are regarded as one of the earliest known organized assassination units of cloak and daggers, predating the Order of Assassins and Japanese ninja by centuries. The derived Spanish term sicario is used in contemporary Latin America to describe a hitman.