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For the story of the destruction of the tribe of 'Ad through violent storm-winds, see 54:19 and, more particularly, {69:6-8}.
I.e., the suffering which was yet to befall the rest of the tribe of 'Ad. My addition, between brackets, of the words "in the life to come" is based on the interpretation advanced by Tabari, Zamakhshari and Razi, according to whom the first mention of the saving of Hud and his followers refers to the destruction of the people of 'Ad in this world, and the second, to the latters' chastisement in the hereafter.
A few just men might suffer for the iniquities of the many. But Allah's Plan is perfect and eventually saves His own people by special Grace, if they have Faith and Trust in Him.