Introducers were freelance operatives who worked within the Quilan Hive on the planet Lan Barell. They facilitated meetings with Human Barellians who were difficult to communicate with due to their habit of not expressing emotion through facial expressions. Introducers were adept at navigating the labyrinthine Quilan Hive and producing permits and visas quickly. At least one prominent introducer was part of the Alliance to Restore the Republic cell on the planet.
Sources
"Lan Barell" — Star Wars Adventure Journal 1 (First mentioned)