by John Marshall Harlan, United States v. E. C. Knight Company…
“ In my judgment, the citizens of the several states composing the Union are entitled of right to buy goods in the state where they are manufactured, or in any other state, without being confronted by an illegal combination whose business extends throughout the whole country, which, by the law everywhere, is an enemy to the public interests, and which prevents such buying, except at prices arbitrarily fixed by it. I insist that the free course of trade among the states cannot coexist with such combinations. ”
