The Loyalty Investigation Board was a Cardassian organization in operation in 2370. (DS9 novel: Betrayal)
Exactly what this organization's function is, is not known. However, judging by the name, it could be a group that investigates people's allegiances, and/or cases of treason. Whether this organization was always a part of the Cardassian government, or just the Revanche government, is not known.