"In the days of peace every precaution should be taken to insure that there are no forces making for war. Just as we now forbid the trafficking in certain drugs, in the sale of poisons, just as we forbid the making of any imprint that suggests a coin or currency, just as experience has demonstrated that men may not make profit out of certain things because of the danger of abuse, so in the gravest of all dangers laws should be passed taking from those who might gain from war or preparations for war every hope that advantage could come to them by such a calamity."