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The Mengenites were a civilization native to the Mengen star system in the Alpha or Beta Quadrant, in the vicinity of Sol in Federation space in the 23rd century.
The Mengenites were a sovereign group that were not a member of the Federation by the year 2270. Commander Paul Burch of Starfleet feared that the power schemes of Vice Admiral Vaughan Rittenhouse were a threat to sovereign civilizations like the Mengenites. (TOS - Fortunes of War novel: Dreadnought!)