Robert H. Jackson, National Labor Relations Board v…
“ The first is that, even if inclusion of a forbidden provision is enough to justify the Board in setting it aside as to the future, it does not follow that it can be wholly ignored in judging events that occurred before it was set aside. It is one thing for the Board to say that the parties should not go on under such a contract; it is another to say that no effect whatever may be given to a contract negotiated in good faith by the union and the employer which both believed to be valid and operative, to which both were conforming their conduct, and which no authority had yet held void. ”
