Melville Fuller,
Western Union Tel Company v. Indiana…
“ The necessity of classifying the subjects of taxation in order to reach uniform and just results, as far as possible, is not denined; nor that the infliction of penalties on delinquency is a usual and legitimate mode of compelling the prompt payment of taxes. But the contention is that this provision for a 50 per cent. penalty is an arbitrary discrimination, not falling within the principle of classification, and therefore open to constitutional objection, as amounting to a denial of the equal protection of the laws, and a deprivation of property without due process of law. ”
