The United Steelworkers (USW)... [said] that Region 28 of the National Labor Relations Board (NLRB) has issued a far-reaching complaint against ASARCO LLC, a subsidiary of mining conglomerate Grupo Mexico, sanctioning the company for its numerous unlawful actions at and away from the bargaining table. Almost 2,000 members of eight international unions have been on strike at five copper mining and processing facilities in Arizona and Texas since Oct. 13, 2019. In the complaint, the NLRB outlines ASARCO management's overall failure to bargain in good faith with the unions representing its employees, both before and during the ongoing dispute... [A]llegations include bargaining with no intention of reaching an agreement, failing to provide information needed for bargaining, not having decision makers at the table with adequate authority to negotiate, discriminating against union representatives, and illegally declaring an impasse and unilaterally implementing changes to working conditions.

The NLRB's complaint asserts that the strikers are unfair labor practice strikers, who are protected against permanent replacement under existing U.S. labor law.