Does a union have a right to protest about a layoff?

Finally, even if the Union had waived its right to bargain about previous layoffs by not protesting them, it would not have thereby waived its right to bargain about the more extensive layoffs here. See NLRB v. Miller Brewing Co., 408 F.2d 12, 15 (9th Cir.1969) (a right once waived is not lost forever; each time the bargainable event occurs the Union has the election of requesting negotiations or not). Whatever the Union might have done with respect to prior layoffs, it unequivocally requested bargaining as to this particular layoff.