The government of the Kzinti, a carnivorous feline species who fought and lost four wars against humanity and were forbidden by the Treaty of Sirius from keeping armed ships.
The Kzinti appear in the animated episode The Slaver Weapon, adapted by Larry Niven from his own Known Space story. The Patriarchy has been stripped of weapons since its defeats by Earth, so its ambitions are pursued by supposed pirates whom the government can disown.
In 2269 one such crew, commanding the stolen police ship Traitor's Claw under the Chuft-Captain, ambushes Spock, Sulu and Uhura and seizes a stasis box holding a shape-changing weapon of the vanished Slavers. The Kzinti regard plant-eaters and females as beneath notice, which Spock and Uhura turn to advantage.
The weapon's own computer, deciding it has fallen into enemy hands, tricks the Kzinti into triggering its self-destruct. Lower Decks later shows a Kzinti, Ensign Taylor, serving in Starfleet aboard the Cerritos, and Riker mentions trouble with the Kzinti in the Picard episode Nepenthe.