Felix Frankfurter,
National Labor Relations Board v…
“ If, however, either party neglects to give such notice and waits, let us say, until 30 days before the end of the contract to give the notice, then there is a waiting period provided during which the strike is an unlawful labor practice for 60 days from that time, or to the end of the contract and 30 days beyond that time. In that case there is a so-called waiting period during which a strike is illegal, but it is only brought about by the failure of the union itself to give the notice which the bill requires shall be given. ”
