Mirror universe
(coexisting on another dimensional plane)
(coexisting on another dimensional plane)
Terran General Order Four was a directive issued by the Terran Empire. It specifically stated, "Any exotic species deemed a threat to the Imperial Supremacy will be extinguished without prejudice."
In the 2250s, this directive was used as a justification for the orbital bombardment of the alien insurgent camp on the planet Harlak. (DIS: "The Wolf Inside")