The Metal Trade Council filed a complaint with the NLRB after Sandia National Laboratories sent letters to union members informing them about their offer for a $2,000 bonus for every worker if the new contract was settled before the last one expired on Friday night. About 430 MTC members voted in favor of a strike against Sandia after negotiations broke down in a bargaining session last Friday when the union voted to reject management’s “best, last, and final offer”. The strike has not yet been initiated, and if the NLRB approves MTC’s complaint alleging Sandia’s failure to bargain in good faith, the union will have even greater leverage against the company.
See "Union says Sandia negotiated in bad faith", Kevin Robinson Avila, The Albuquerque Journal, October 3, 2017