During ongoing union negotiations, Bill Barker, a company vice president at the Tampa Tribune, sent employees a series of letters, which were legal and accurate, describing the negotiation process from his perspective. In talking to supervisors about the letters one night after he arrived for his third shift, an employee, Greg McMillen, said: “I hope that f**king idiot Barker doesn’t send me another letter. I’m pretty stressed, and if there is another letter you might not see me. I might be out on stress.” McMillen was fired for violating a company policy against using threatening and abusive language in the company building. McMillen complained to the NLRB. Did McMillen’s firing violate Section 7 of the NLRA? Explain.