A Delta Quadrant species locked in a long war with the Vori, whose propaganda paints them as monstrous beasts, as Chakotay discovered when he was conditioned to hate them in 2374.
The Kradin are a tall humanoid species of fearsome appearance, locked in a long war with their neighbours, the Vori. They appear in the Voyager episode Nemesis.
Chakotay's shuttle is brought down over the war zone and he falls in with a band of young Vori soldiers. They speak of the Kradin only as beasts or the nemesis, and accuse them of murdering civilians and desecrating the dead. After seeing a village destroyed, Chakotay takes up arms against them.
Meanwhile Voyager has been dealing with a courteous Kradin ambassador, who helps the crew to find their first officer. Tuvok reveals to Chakotay that his experiences were a Vori training simulation designed to recruit him. Which side's account of the war is true is never settled, and Chakotay finds that his hatred does not simply fade.