Definition of "Chekist"

(historical) An agent of the Cheka, the Soviet Russian secret police from 1917 to 1922, replacing the Okhrana secret police of Tsarist Russia; succeeded by the OGPU and NKVD.

(by extension, metonymically) A national security official of the KGB, FSB or any of the state security intelligence agencies of the Soviet Union or Russian Federation.  examples