HELENA, Mont. — One Montana hospital went into lockdown and called police after a woman threatened violence because her relative was denied her request to be treated with ivermectin. Officials of another Montana hospital accused public officials of threatening and harassing their health care workers for refusing to treat a politically connected covid-19 patient with that antiparasitic drug or hydroxychloroquine, another drug unauthorized by the Food and Drug Administration to treat covid. And in neighboring Idaho, a medical resident said police had to be called to a hospital after a covid patient’s relative verbally abused her and threatened physical violence...