KRA - KRU

Officer Kras tried to force the Capellans of Capella IV to allow the Klingons mine for topaline in 2267. In order to achieve this goal, Kras supported whole-heartedly the Capellan named Maab. The reasoning for Kras's act was that Maab led a revolt against Teer Akaar. Teer Akaar wanted a Federation-controlled mining establishment. In this fray of strategies, Maab died in his attempt to protect the wife of Teer Akaar from Kras. (Friday's Child)

Klingon agent arming the natives with flintlock rifles. (A Private Little War)

Commander of the Klingon Bird-of-Prey who in 2285 obtained information about the Federation project named Genesis. The weapons officer accidentally destroyed the Grissom, therefore, Kruge killed him. He captured Sa'vik, Spock, and David. Then, he had David killed. Later on Kirk tricks Kruge into sending his army over to the Enterprise and lost them all. Eventually, Kirk killed Kruge. (Star Trek III: The Search for Spock)