For many years, I have testified and written about Antifa and its growing anti-free speech philosophy. Some Democratic leaders have embraced this violent movement, which continues to gain strength on campuses and its cities across the nation. It is also a global movement. That is reflected in the alarming election of Antifa candidates to the French National Assembly as well as the European Parliament. That is quite an accomplishment for a movement that President Joe Biden dismissed as “just an idea.”As discussed in my new book, “The Indispensable Right: Free Speech in an Age of Rage,” I explore the history...