Ezekiel 44, “You shall be ministers in My sanctuary, gatekeepers of My house and you shall stand before the people and minister to them.”
Remember, in the Hebrew Gatekeeper simply means servant.
Their responsibility was taking care of the temple, they were to control what came into the city. They were literally involved in every aspect of the cities affairs. The gates of influence in the city.
The Gates of influence:
Church, Family, education, Government, Business, Media, Entertainment