If the local majority attempts to oppress the minority, or one class another, the state is bound to interpose.
 John Stuart Mill, Considerations on Representative Government (1861). copy citation

Context

“The localities may be allowed to mismanage their own interests, but not to prejudice those of others, nor violate those principles of justice between one person and another of which it is the duty of the state to maintain the rigid observance. If the local majority attempts to oppress the minority, or one class another, the state is bound to interpose. For example, all local rates ought to be voted exclusively by the local representative body; but that body, though elected solely by rate-payers, may raise its revenues by imposts of such a kind, or assess them in such a manner, as to throw an unjust share of the burden on the poor, the rich, or some particular class of the population: it is the duty, therefore, of the Legislature, while leaving the mere amount of the local taxes to the discretion of the local body, to lay down authoritatively the mode of taxation and rules of assessment which alone the localities shall be permitted to use.” source