An uprising in 2366 by chemically and psychologically altered war veterans of Angosia III, who escaped their lunar prison and confronted their government while the Enterprise-D was assessing the planet for Federation membership.
The Angosian veterans' revolt is seen in the Next Generation episode The Hunted. Angosia III has applied to join the Federation, and Picard is asked to help recapture an escaped prisoner from the Lunar V penal settlement.
The prisoner, Roga Danar, turns out to be a decorated soldier. During the Tarsian War the Angosian government altered its volunteers with drugs and conditioning to make them perfect fighters, then found it could not undo the work and confined them on the moon rather than bring them home. Danar outwits the Enterprise crew, frees his comrades and leads them to the capital.
Prime Minister Nayrok asks Picard to put down the rising. Picard replies that it is an internal affair and beams away, leaving the government face to face with the men it made. He notes that the membership application will be looked at again once Angosia has dealt with its own veterans.