William Howard Taft,
United States v. Michigan Portland Cement Company…
“ It declares to be an offense any device whereby transportation shall be given at any less rate than named in the published tariff 'or whereby any other advantage is given or discrimination is practiced.' Where the offense consists in a rebate, as that term is usually understood, to wit, transportation at a less rate in dollars and cents than the published rate which the shipping public are charged, a published tariff is, of course, necessary to constitute the standard, departure from which is the crime. ”
