Final answer:
Main growers like Tyson do not allow filmmakers in their chicken factories for several reasons, including protecting trade secrets, concerns about animal rights activists, and maintaining a competitive advantage.
Step-by-step explanation:
Main growers like Tyson do not allow filmmakers in their chicken factories for a variety of reasons. One reason is to protect trade secrets and proprietary processes, as allowing filmmakers inside could potentially reveal sensitive information about their operations. Additionally, concerns about animal rights activists may also play a role, as the presence of filmmakers could attract attention from activists advocating for better treatment of animals. Lastly, Tyson and other main growers may want to maintain a competitive advantage in the market by keeping their operations confidential and not giving competitors insights into their practices.