You are “killing people,” President Biden told social media companies a couple of years ago. He sought to shame executives into censoring more Americans. Biden has lashed out at disinformation by anti-vaxxers, “election deniers” and others. This month, those words were thrown back at Biden himself as a “genocide denier” by protesters who have labeled him “Genocide Joe” over his support for Israel. After years of supporting censorship and blacklisting of people with opposing views, politicians and academics are finding themselves the subjects of the very anti-free speech tactics that they helped foster.