George Sutherland, Macallen Company v. Massachusetts…
“ On that assumption the immunity of the national bonds is too important to allow any narrowing beyond what the acts of Congress permit. We think it would be going too far to say that they allow an intentional interference that is only prevented from being direct by the artificial distinction between a corporation and its members. A tax very well may be upheld as against any casual effect it may have upon the bonds of the United States when passed with a different intent and not aimed at them, but it becomes a more serious attack upon their immunity when they are its obvious aim. ”
