George Sutherland, Russell Motor Car Company v. United States…
“ To modify a contract is in effect to make a new one, and it puts something of a strain on our conception of the functions of government to concede its power to make contracts between private parties, to which neither may assent, and which, consequently, neither will be bound to perform.We do not mean to deny the power of Congress, in time of war, to authorize the President to modify private contracts (leaving the parties free, as between themselves, to accept or not) , nor do we suggest that Congress has not done so by the present statute ”
