Benjamin N. Cardozo,
Henneford v. Silas Mason Company…
“ Least of all will they be permitted to accomplish that result when equality and not preference is the end to be achieved. Catch words and labels, such as the words 'protective tariff,' are subject to the dangers that lurk in metaphors an symbols, and must be watched with circumspection lest they put us off our guard. A tariff, whether protective or for revenue, burdens the very act of importation, and if laid by a state upon its commerce with another is equally unlawful whether protection or revenue is the motive back of it. ”
