Owen J. Roberts, United States v. Constantine — Opinion of the Court
“ By classifying in such a mode Congress is not punishing for a crime against another government. It is not punishing at all. It is laying an excise upon a business conducted in a particular way with notice to the taxpayer that if he embarks upon that business he will be subjected to a special burden. What he pays, if he chooses to go on, is a tax and not a penalty. ”
