A poll tax statute exempting women, the aged and minors, does not make an arbitrary classification[1088].
Property Taxes
The State's latitude of discretion is notably wide in the classification of property for purposes of taxation and the granting of partial or total exemption on the grounds of policy,[1089] whether the exemption results from the terms of the statute or the conduct of a State official under it.[1090] A provision for the forfeiture of land for nonpayment of taxes is not invalid because the conditions to which it applies exist only in a part of the State.[1091] Intentional and systematic undervaluation by State officials of other taxable property in the same class contravenes the constitutional right of one taxed upon the full value of his property;[1092] but mere errors in judgment resulting in unequal overvaluation or undervaluation, not intentional or systematic, will not support a claim of discrimination.[1093] Differences in the basis of assessment are not invalid where the person or property affected might properly be placed in a separate class for purposes of taxation.[1094] An owner aggrieved by discrimination is entitled to have his assessment reduced to the common level.[1095] Equal protection is denied if a State does not itself remove the discrimination; it cannot impose upon the person against whom the discrimination is directed the burden of seeking an upward revision of the assessment of other members of the class.[1096] A corporation whose valuations were accepted by the assessing commission cannot complain that it was taxed disproportionately, as compared with others, if the commission did not act fraudulently.[1097]
Special Assessment
A special assessment is not discriminatory because apportioned on an ad valorem basis, nor does its validity depend upon the receipt of some special benefit as distinguished from the general benefit to the community.[1098] Railroad property may not be burdened for local improvements upon a basis so wholly different from that used for ascertaining the contribution demanded of individual owners as necessarily to produce manifest inequality.[1099] A special highway assessment against railroads based on real property, rolling stock and other personal property is unjustly discriminatory when other assessments for the same improvement are based on real property alone.[1100] A law requiring the franchise of a railroad to be considered in valuing its property for apportionment of a special assessment, is not invalid where the franchises were not added as a separate personal property value to the assessment of the real property.[1101] In taxing railroads within a levee district on a mileage basis, it is not necessarily arbitrary to fix a lower rate per mile for those having less than 25 miles of main line within the district than for those having more.[1102]
POLICE POWER
Classification
Justice Holmes once called the equal protection clause the "usual last refuge of constitutional arguments."[1103] When State action is attacked under the due process clause, the assailant usually charges also that he is denied the equal protection of the laws. Except where discrimination on the basis of race or nationality is shown, few police regulations have been found unconstitutional on this ground.[1104] The Court has condemned a statute which forbade stock insurance companies to act through agents who were their salaried employees, but permitted mutual companies to operate in this manner.[1105] A law which required private motor vehicle carriers to obtain certificates of convenience and necessity and to furnish security for the protection of the public was held invalid by reason of the exemption of carriers of fish, farm and dairy products.[1106] Discrimination among milk dealers without well advertised trade names, giving those who entered business before a specified date the benefit of a price differential denied to those who commenced operations thereafter, is arbitrary and unlawful.[1107] A statute providing for the sterilization of defectives in State institutions was sustained;[1108] but a similar act applicable to triple offenders was held void.[1109]