More than three years ago, a small group of government scientists came forward with disturbing allegations.

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.

After the scientists pushed back, they received negative performance reviews and three of them were removed from their positions in the EPA’s division of new chemicals and reassigned to jobs elsewhere in the agency.

On Wednesday, the EPA inspector general announced that it had found that some of the treatment experienced by three of those scientists — Martin Phillips, Sarah Gallagher and William Irwin — amounted to retaliation.

Three reports issued by the inspector general confirmed that the scientists’ negative performance reviews as well as a reassignment and the denial of an award that can be used for cash or time off were retaliatory. They also detailed personal attacks by supervisors, who called them “stupid,” “piranhas” and “pot-stirrers.”

The reports called on the EPA to take “appropriate corrective action” in response to the findings. In one case, the inspector general noted that supervisors who violate the Whistleblower Protection Act should be suspended for at least three days.

In a statement to ProPublica, the EPA tied the problems laid out in the report to Trump. “The events covered by these reports began during the previous administration when the political leadership placed intense pressure on both career managers and scientists in EPA’s new chemicals program to more quickly review and approve new chemicals,” the agency wrote, going on to add that the “work environment has been transformed under Administrator Michael Regan’s leadership.”

“I’m worried about the future because there are groups out there pushing for changes to the civil service that would make it so I could be fired and replaced with a non-scientist,” said Phillips, a chemist. Publicly available versions of the inspector general’s reports redacted the names of all EPA employees, including the scientists, but Phillips, Gallagher and Irwin confirmed that the investigations focused on their complaints.

Phillips said the experience of having his work changed, facing hostility from his supervisors and agonizing about whether and how to alert authorities was traumatic. He began pushing back against the pressure from his bosses in 2019, trying to explain why his calculations were correct and refusing their requests to change his findings, he said.