An-Jirok

an-Jirok was the name of a dissident group on Altair VI, which launched a coup against the Altair government in 2348. During that coup, Starfleet Ensign Manojlovich, assistant chief of security of the USS Lexington, plus four other Lexington guards, were killed.

The an-Jirok ruled Altair VI until 2351, at which time the former system of government was restored. (novel: The Brave and the Bold)