It's Kohr-ah. In the Star Control universe, the race known as the Ur-Quan are split down a racial/cultural divide. Kind of odd since they work together as well, but basically the Kzer-za (Green) ur-quan believe all non-Ur-Quan races must either be enslaved by the Ur-Quan or made fallow (imprisoned beneath impenetrable slave shields.) Whereas the Kohr-Ah, or Black Ur-Quan, believe that all possible threats to Ur-Quan supremacy must be eliminated... and that all non-Ur-Quan sentients are threats to UQ supremacy. Not nice people, Kohr-ah. So basically they get together and have a massive civil war every so often to see who gets to decide what happens. It's still odd because they don't exactly "hate" each other, and in the event of external threat they're apt to stop fighting and double-team the threat. Ur-Quan are just weird, period. Not to mention fairly xenophobic in some ways... the Kzer-za being kinda squeamish and controlly and dangerous to alien races, and the Kohr-ah being kinda... ya know... genocidal. Hell, Kohr-Ah captains SIT on large bone piles. Bone piles made up of remains from every race the captain has had the pleasure of helping to exterminate....
I love SC2/Ur-Quan Masters. Good game. Go download it. Play it. NOW.