Three reports issued by the agency’s inspector general detailed personal attacks suffered by the scientists — including being called “stupid,” “piranhas” and “pot-stirrers” — and called on the EPA to take “appropriate corrective action” in response.

During President Donald Trump’s administration, they said, their managers at the Environmental Protection Agency began pressuring them to make new chemicals they were vetting seem safer than they really were. They were encouraged to delete evidence of chemicals’ harms, including cancer, miscarriage and neurological problems, from their reports — and in some cases, they said, their managers deleted the information themselves.