Syngenta, one of the largest agribusinesses in the world, had asked [Dr. Tyrone Hayes] to conduct experiments on the herbicide atrazine, which is applied to more than half the corn in the United States… When Hayes discovered that atrazine might impede the sexual development of frogs, his dealings with Syngenta became strained, and, in November, 2000, he ended his relationship with the company.

Hayes continued studying atrazine on his own, and soon he became convinced that Syngenta representatives were following him to conferences around the world. He worried that the company was orchestrating a campaign to destroy his reputation…

In June, 2003, Hayes paid his own way to Washington so that he could present his work at an E.P.A. hearing on atrazine. The agency had evaluated seventeen studies. Twelve experiments had been funded by Syngenta, and all but two showed that atrazine had no effect on the sexual development of frogs. The rest of the experiments, by Hayes and researchers at two other universities, indicated the opposite…

In 2005, [Sherry Ford, Syngenta’s communications manager] made a long list of methods for discrediting him: “have his work audited by 3rd party,” “ask journals to retract,” “set trap to entice him to sue,” “investigate funding,” “investigate wife.” The initials of different employees were written in the margins beside entries, presumably because they had been assigned to look into the task…

Rachel Aviv: The Scientist Who Took on a Leading Herbicide Manufacturer : The New Yorker