Within the newest signal of a rising backlash inside company America to the 88-year-old federal company that enforces labor rights, Amazon argued in a authorized submitting on Thursday that the Nationwide Labor Relations Board was unconstitutional.

The transfer adopted an identical argument by SpaceX, the rocket firm based and run by Elon Musk, in a authorized grievance in January, and by Dealer Joe’s during a labor board hearing a couple of weeks later.

The labor board consists of a prosecutorial arm, which points complaints towards employers or unions deemed to have violated federally protected labor rights; administrative judges, who hear complaints; and a five-member board in Washington, to which choices will be appealed.

Amazon’s submitting was a part of a case earlier than an administrative choose by which labor board prosecutors have accused Amazon of illegally retaliating towards staff at a Staten Island warehouse often known as JFK8, which unionized two years in the past.

The corporate’s legal professionals repeatedly denied of their submitting that Amazon had damaged the legislation. Then, beneath a bit titled “Different Defenses,” they argued that “the construction of the N.L.R.B. violates the separation of powers” by “impeding the manager energy supplied for in Article II of the US Structure.”

The corporate additionally argued that the board or its actions or proceedings violated Articles I and III of the Structure, in addition to the Fifth and Seventh Amendments — within the final case as a result of, the submitting stated, board hearings can search authorized treatments past what’s allowed with no trial by jury.

Amazon declined to remark.

The claims it made within the submitting echo arguments that legal professionals for SpaceX made in a federal lawsuit final month, after the labor board issued a grievance accusing the corporate of illegally firing eight workers for criticizing Mr. Musk. SpaceX sued in Texas, however a federal choose there on Thursday granted the board’s movement to switch the case to California, the place the corporate’s headquarters are situated.

In an announcement, the board’s normal counsel, Jennifer A. Abruzzo, stated, “I’m happy that SpaceX’s blatant forum-shopping efforts in Texas trying to enjoin the company’s litigation towards it have failed.”

Wilma Liebman, a chairwoman of the labor board beneath President Barack Obama, known as the arguments by Amazon and SpaceX “radical,” including that “the constitutionality of the N.L.R.B. was settled almost 90 years in the past by the Supreme Court docket.”

The arguments seem to align with a broader conservative effort to query the constitutionality of quite a lot of regulatory actions, a few of which have resulted in instances earlier than the Supreme Court docket.

In January, the Supreme Court docket additionally agreed to listen to a case introduced by Starbucks, which is difficult a federal choose’s order reinstating workers who have been fired throughout a union marketing campaign. The end result of the case may rein within the labor board’s longstanding apply of searching for reinstatement for staff whereas their instances are litigated, a course of that may take years.