Law firms around the United States are lining up plaintiffs for what they say could be mass tort" actions against agrichemical giant Monsanto Co that claim the company's Roundup herbicide has caused cancer in farm workers and others exposed to the chemical. The latest lawsuit was filed Wednesday in Delaware. The lawsuit is similar to others filed last month in New York and California accusing Monsanto of long knowing that the main ingredient in Roundup, glyphosate, was hazardous. Monsanto "led a prolonged campaign of misinformation to convince government agencies, farmers and the general population that Roundup was safe," the lawsuit states. The litigation follows the World Health Organization's declaration in March that there was sufficient evidence to classify glyphosate as "probably carcinogenic to humans." "We can prove that Monsanto knew about the dangers of glyphosate," said Michael McDivitt, whose Colorado-based law firm is putting together cases for 50 individuals. Roundup ... brought Monsanto $4.8 billion in revenue in its fiscal 2015. But questions about Roundup's safety have dogged the company for years. Attorneys who have filed or are eying litigation cited strong evidence that links glyphosate to non-Hodgkin lymphoma. Monsanto is also fending off claims over its past manufacturing of polychlorinated biphenyls (PCBs), which the WHO classifies as known carcinogens. At least 700 lawsuits against Monsanto or Monsanto-related entities are pending.