And there were in the city (of the people of Thamud) nine prominent leaders (leading their respective parties) who used to spread destructive activities in the land and would not do constructive works
There was in that city a gang of nine men who caused corruption and rebelled.
Sayyed Abbas Sadr-Ameli
And there were in the city nine (groups of) persons who made mischief in the land and would not reform
Al-muntakhab fi tafsir al-Qur'an al-Karim
Among the leaders in Saleh’s town were nine men whose wickedness exceeded all limits and reached an irreversible degree, they flourished at spreading mischief in the land and at creating discord