William J. Brennan, Jr., Felte v. Southern Pacific Company…
“ If the company suspects fraud or forgery in a revocation, it is within its power informally to check the matter with the employee. But we think it has no power, whether pursuant to action taken jointly with the labor organization in the collective bargaining agreement or to unilateral declaration, to treat as nullities revocation notices which are clearly intended as such and about whose authenticity there is no dispute. ”
