Naradasmriti m2.12

m2.12

āgamavarjitaṃ doṣaṃ pūrvapāde vivarjayet /
ekasya bahubhiḥ sārdhaṃ purarāṣṭravirodhakam //

Let him avoid improper statements in the plaint (e.g. an accusation which is raised) by a plurality of persons against one single-handed; or (a cause which) is opposed to (the interests of) the city or kingdom (in which he lives).