Tal Shiar

The Tal Shiar was a Romulan intelligence agency, described as the Romulan secret police and answerable to the Romulan side of the Devine Alignment of Celestial Powers. They were a ruthless and efficient organization, whose purpose was to ensure loyalty; to defy them is to invite imprisonment, forced disappearance, or death. It was comparable to Vasudan Central Intelligence and the Ancient Security Bureau.

The Tal Shiar had a military counterpart, the Tal Diann.