Kreel

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The Kreel are a space-faring humanoid race of primarily scavengers. They have frequently come into conflict with the Klingons since the 23rd century.

In 2346, Kreel scavengers went through the wreckage of the Khitomer Massacre.

In early 2365, the Kreel discovered a stash of advanced weaponry on an uninhabited planet and began attacking Klingon ships with them. The USS Enterprise was called in to mediate the dispute. (TNG novel: Strike Zone)

Sometime prior to 2373, a Kreel raider was defeated by Nelkarites, who modified and used the vessel as their own. (NF novel: The Two-Front War)

In 2376, the Kreel assisted the Al'Hmatti freedom fighters and attacked Klingon ships associated with taD. The IKS Gorkon was called in to escort Ambassador Worf to mediate the dispute. (TNG novel: Diplomatic Implausibility)

During 2378, the Kreel were one of several races to attempt to scavenge the Rashanar Battle Site. (TNG novel: A Time to Be Born)

At some point between 2377 and 2380, the Kinshaya conquered the Kreel and absorbed their resources as the first step of their escalation in their long-time conflict with the Klingon Empire. (TNG novel Q & A)