Kirk and a representative of the Brotherhood

The "Brotherhood of Aliens" was a group of prisoners at the Rura Penthe gulag in the late-23rd century.

In 2293, when Captain Kirk and Doctor McCoy arrived at the prison, after having been framed for the assassination of Klingon Chancellor Gorkon, a large, threatening inmate demanded their allegiance to the Brotherhood of Aliens, a condition to which Kirk swiftly agreed, recognizing that he was not being given a choice in the matter. (Star Trek VI: The Undiscovered Country)

In a scene scripted for Star Trek VI but not in the actual film, Martia explains who the Brotherhood of Aliens were meant to have been when she tells Kirk, "[They are] prisoners from outside the Klingon system. They tend to band together." [1]
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