"Ministry of Disturbance," i a short story written by H. Beam Piper. First appeared in the December 1958 issue of "Astounding," (where Cambpell blurbed it, "Sometimes getting a job is harder than the job after you get it — and sometimes getting out of a job is harder than either "). Republished in the collection Empire, in (Ministry of Disturbance and Other SF|Ministry of Disturbance and Other SF)) and in the game supplement Thousand Suns: Transmissions from Piper for the Thousand Suns RPG.
In this story, a Galactic Empire of thousands of planets has been at peace for hundreds of years. Production all across the Empire is regulated to keep markets and economies stable. With this kind of system in place, why is there suddenly a plot to overthrow the current Emperor, and who is behind it?