DaiMon Birta is the Ferengi commander who tells Jean-Luc Picard that his old enemy Bok has been stripped of rank and bought his way out of prison, in the seventh-season episode Bloodlines.
Birta appears in Bloodlines. When Bok reappears, threatening to kill a son Picard never knew he had in revenge for the death of his own son at Maxia, Picard contacts the Ferengi to learn what has become of him.
Birta, a DaiMon, is unhelpful until he sees an advantage in talking. He explains that Bok lost his command after his earlier scheme against Picard, was sent to Rog Prison and purchased his release, and that he is acting entirely without official sanction.
The conversation confirms that there is no profit in Bok's vendetta, a point Picard later uses to turn Bok's own hired crew against him once the fraud of Jason Vigo's altered DNA is exposed.