Documents released Tuesday in a lawsuit against Monsanto raised new questions about the company's efforts to influence the news media and scientific research and revealed internal debate over the safety of its highest-profile product, the weed killer Roundup. The active ingredient in Roundup, glyphosate, is the most common weed killer in the world. The documents underscore the lengths to which the agrochemical company goes to protect its image. Documents show that Henry I. Miller ... a vocal proponent of genetically modified crops, asked Monsanto to draft an article for him that largely mirrored one that appeared under his name on Forbes's website in 2015. An academic involved in writing research funded by Monsanto, John Acquavella, [wrote] in a 2015 email to a Monsanto executive, "I can't be part of deceptive authorship on a presentation or publication." He also said of the way the company was trying to present the authorship: "We call that ghost writing and it is unethical." Mr. Miller's 2015 article on Forbes's website was an attack on the findings of ... a branch of the World Health Organization that had labeled glyphosate a probable carcinogen. The documents also show that A. Wallace Hayes, the former editor of a journal, Food and Chemical Toxicology, has had a contractual relationship with Monsanto. In 2013, while he was still editor, Mr. Hayes retracted a key study damaging to Monsanto that found that Roundup, and genetically modified corn, could cause cancer and early death in rats.