Over the past few years, social justice activists have demonstrated an increased ability to suppress controversial viewpoints. To take a few examples: A few months ago, mathematician Theodore Hill described in a Quillette essay how progressive groups were able to get a research paper of his on a biological phenomenon known as the “Greater Male Variability Hypothesis” removed from two separate journals, as well as to intimidate his co-author into silence. Hill’s article was published just a week after another article by endocrinologist Jeffrey Flier, former dean of Harvard Medical School, who described how social justice activists had managed to get an academic journal to initiate a review of an already-published research paper by Brown University medical researcher Lisa Littman on gender dysphoria. Brown also deleted a reference to the paper from its website. Both Hill and Flier point out that they’ve never experienced anything like this before. Hill wrote: “In my 40 years of publishing research papers I had never heard of the rejection of an already-accepted paper.” Flier noted: “In all my years in …