The Night Alliance was a terrorist organization that operated on the planet Vulcan in its distant past long before the rise of Surak and his peaceful message of logic.
History and specifics[]
It was an offshoot branch of the older Mastercraft that had disbanded following the death of its leader T'Meheh in a hovercar accident. The Alliance demanded marriage into both Duveh and Lassiriheh royal houses along with a bride/groom-payments of more then five million nakh. (TOS novel: Spock's World)