http://www.oyez.org/cases/1901-1939/1903/ U.S. Supreme Court Cases, presented by The Oyez Project (www.oyez.org) en-us <p>At the urging of dairy farmers, Congress passed an act imposing a tax of 10 cents per pound on oleomargarine that was artificially colored yellow. Noncolored margarine was taxed only one-quarter of a cent per pound. McCray, a licensed dealer, did not pay the higher tax while selling the colored product. After losing his case in lower courts, McCray appealed to the Supreme Court.</p> http://www.oyez.org/cases/1901-1939/1903/1903_301/