Holding that the NLRB has the authority to interpret CBAs in the first instance where its interpretation is for the purpose of “enforc[ing] a statutory right which Congress considered necessary to allow labor and management to get on with the process of reaching fair terms and conditions of employment”
In C C Plywood the Supreme Court said that the disputed contract provision, in dealing with increases for "particular employee[s]", did not authorize a unilateral increase for a group of employees which would invalidate previously negotiated wage differentials.