In Klingon society, the warrior caste (or warrior class) were a social class whose members were soldiers of the Klingon Empire. It was only one of several other classes in the Empire, including teaching and science. During Earth's 22nd century, however, the warrior caste began to rise in prominence, even gaining control of the court system.
Prior to 2152, Humans were under the impression that all Klingons were warriors. Captain Jonathan Archer shared this belief until informed otherwise by Kolos, whose parents were not a part of the warrior caste and had encouraged their son to become a lawyer. Kolos himself held contempt for the warrior class due to their misuse of the court system and the fact that it had exceeded justice and truth in importance. (ENT: "Judgment")
Antaak was born into the warrior caste. When Antaak chose a career in medicine, however, his father disowned him. (ENT: "Divergence")
According to the novelization of Star Trek VI: The Undiscovered Country (p. 33), Chancellor Gorkon was referred to, by Spock, as not being a member of the warrior class.