Trexatian

The Trexatians are a marauding people with no respect for other species rights. They recently aquired warp drive, and celebrated by attacking the T'hirda and the Xochin. When T'hirda applied for Federation membership, the Trexatians agreed to stop attacking others. Before too long, the people of Trexat were at it again, this time with the Repoki. (TNG novel: Resistance)