Charles Evans Hughes, James v. Dravo Contracting Company…
“ The element of discrimination becomes important only in a case where a tax which would otherwise be permissible is aimed at the taxpayer because of his relation to the government. Of course a state cannot lay a heavier burden upon those contracting with the government simply because they are such contractors. A discrimination of that nature on its face spells a hostile purpose, an intent to hinder and burden the government, to impede its operations, and to discourage dealing with it. ”
