Real World article
(written from a Production point of view)

The B'nok faction was a group mentioned in the script of the Star Trek: The Next Generation episode "Rightful Heir", but not in the final version of the episode.

In the script, it was considered that the Klingon appearing to be Kahless the Unforgettable might be a stalking horse for someone who intended to seize control of the Klingon Empire from Gowron. The Duras sisters or the B'nok faction were then suggested as possibilities.