 A right must normally be a private right to be vindicated in court.An exception to this general proposition is found in "Flast v. Cohen", 392 U.S. 83 (1968).In "Flast", the U.S. Supreme Court held that a private citizen could challenge the constitutionality of a federal tax if the citizen established "a logical link between [their] status [as a taxpayer] and the type of legislative enactment attacked [and] .