The far-right activist is continuing to use her close association with President Trump to go after those she deems insufficiently loyal.Laura Loomer, the far-right activist and self-described Trump administration “loyalty enforcer,” has had another busy stretch.Last Friday, April Falcon Doss, the general counsel of the National Security Agency, was fired after Ms. Loomer spotlighted conservative attacks of her previous work, including for the Senate Intelligence Committee’s Democratic staff.Then the Food and Drug Administration’s top vaccine official, Dr. Vinay Prasad, resigned on Tuesday after a post by Ms. Loomer on social media, in which she pointed out his past statements disparaging...