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For the story of the Thamud and their prophet Salih, see notes [56] and [57] on 7:73 . My interpolation of the word "likewise" at the beginning of this verse is based on the fact that Salih's message to the tribe of Thamud is identical with that of Solomon to the Queen of Sheba - which in itself, is an indication of the sameness of the fundamental truths underlying all revealed religions.
i.e., believers and disbelievers.
The main story of the Thamud, who were broken up into two factions, the rich oppressing the poor and keeping them out of the good things of life and the test case of the She-camel, will be found in xxvi. 141-159 and the notes thereon. The point here is the secret plot of the nine men against the Prophet of Allah, whose teaching, they thought, brought them ill-luck; but what they called ill-luck was the just punishment from Allah for their own ill-deeds. Their plot was foiled, and the whole community, which was involved in evil, was destroyed.