Joseph McKenna, National Cotton Oil Company v. Texas…
“ It is common-place to say that it is the purpose, and indeed duty, of government, to get all it can of good out of the activities of men, and limit or forbid them when they become or tend to evil. Of course, what is evil may not be always clear; but to be able to dispute the policy of a law is not to establish its invalidity. It is certainly the conception of a large body of public opinion that the control of prices through combinations tends to restraint of trade and to monopoly, and is evil. ”
