For free speech advocates, there are few images more chilling than that of Nina Jankowicz singing her now-infamous tune as “the Mary Poppins of Disinformation.” The woman who would become known as the “Disinformation Czar” sang a cheerful TikTok parody of “Supercalifragilisticexpialidocious” to rally people to the cause of censorship. When the press caught wind of President Biden’s plan to appoint Jankowicz as head of the Department of Homeland Security’s new “disinformation board,” Fox News said she “intended to censor Americans’ speech.” The backlash was swift. Plans for the board were suspended, and Jankowicz resigned in 2022. She then sued...