Her friend Melissa Hortman, a longtime Minnesota lawmaker, was murdered at home in June—shot by a man posing as a police officer who had also wounded two others and left behind a hit list of dozens of abortion-rights supporters. Among the names was Ruth Richardson, CEO of Planned Parenthood North Central States. “It was one thing to get a threat; it’s another to have confirmed threats where you have a friend and colleague who is assassinated,” she told Ms.

This tragedy unfolded against a backdrop of federal retreat: Trump pardoned extremists convicted of clinic blockades and violence, and his Justice Department declared it would largely stop enforcing the FACE Act, the law meant to protect providers. Advocates warn these decisions have emboldened extremists, leaving abortion providers more vulnerable than at any time in decades.