Tenn. Code Ann. § 67-5-2408

When suits have not been brought, the commissioner of revenue shall restore the delinquent tax lists of such counties to the county trustee, and the trustee and county mayor shall cause suits to be brought for the collection of such taxes under this part, and it shall also be the duty of the circuit court clerks of the several counties of the state to turn over to the attorney selected by the trustee and county mayor all records of uncollected taxes remaining in the office of the circuit court clerks, and to the end that the attorney, in preparing and filing such bills to enforce the tax lien as herein provided in this part, may include in such bill or bills all delinquent tax debtors.