CUMMING, Ga. — There are four new billboards in Cumming, strategically placed near the Tyson poultry farm.  Each billboard reads “WHISTLEBLOWERS WANTED. CHICKIELEAKS.COM. WHAT IS AMERICA’S LARGEST CHICKEN COMPANY HIDING?” The billboards cost $3,000 and were paid for by Mercy for Animals, an international animal advocacy organization. “The first billboard company rejected us,” Leah Garces, the group’s president, said. “They said ‘no we don’t want to go there.’ The second one agreed. We were hoping to go up earlier in the year, and we had to hunt around to find an advertising company that was willing to work with us.” She says the main purpose of the billboards is to give poultry workers an outlet, so they can report their concerns. “It’s really a platform and a starting place for us to have a dialogue with farmers and say ‘what are your stories? What do you want to get out? What do you want to tell?’ For us to listen and find ways to collaborate. We plan to use this information to pressure the industry to make changes.” “These chickens are raised in long warehouses,” Garces said. “There are no windows. They are stuffed wall to wall by the end of their life. They have...