Back when it was first gaining traction in the 1990s, the anti-vaccination movement was largely considered a far-left thing, attracting believers ranging from barter-fair hippies to New Age gurus and their followers to “holistic medicine” practitioners. And it largely remained that way … until 2020 and the arrival of the COVID-19 pandemic.

As this Sunday’s “Defeat the Mandates” march in Washington, D.C., however, showed us, there’s no longer anything even remotely left-wing about the movement. Populated with Proud Boys and “Patriot” militiamen, QAnoners and other Alex Jones-style conspiracists who blithely indulge in Holocaust relativism and other barely disguised antisemitism, and ex-hippies who now spout right-wing propaganda—many of them, including speakers, encouraging and threatening violence—the crowd at the National Mall manifested the reality that “anti-vaxxers” now constitute a full-fledged far-right movement, and a potentially violent one at that.

The most prominent of these extremists was former progressive icon Robert F. Kennedy Jr., who has morphed over the past decade and longer, due to his obsession with the anti-vaccination cause, into a raving far-right conspiracy theorist. On Sunday, he was one of many who compared anti-pandemic measures such as masking and vaccine mandates to the Holocaust.

“Even in Hitler Germany (sic), you could, you could cross the Alps into Switzerland. You could hide in an attic, like Anne Frank did,” Kennedy said. “I visited, in 1962, East Germany with my father and met people who had climbed the wall and escaped, so it was possible. Many died, true, but it was possible.”

The crowd at the ‘Defeat the Mandates’ march Sunday in Washington was estimated at several thousand.

Many of the rally attendees wore yellow replicas of the Star of David badges that were forced upon Jewish victims of the Holocaust, and many of them carried signs referencing both that horrific episode of history and the German Nazi regime that inflicted it. So did other speakers, such as Del Bigtree, CEO of the anti-vaccination group Informed Consent Action Network, who added a threatening tone directed at journalists.

“Unlike the Nuremberg Trials that only tried those doctors that destroyed the lives of those human beings, we’re going to come after the press,” Bigtree told the crowd.

Violence was also an undercurrent in the audience, some of whom carried signs suggesting a lethal response: “Shoot those who try to kidnap and vaccinate your child.” Another agreed with Bigtree, calling for “Nuremberg Trials 2.0.”

The inherent antisemitism of the anti-vaxxers’ conspiracism was also on full display: A large bus pulled up to the protest area blaring music with lyrics pronouncing “It’s God Over Government,” festooned on its side with mock “Wanted” posters featuring the anti-vaxxers bogeymen, notably Dr. Anthony Fauci, Microsoft founder Bill Gates, and attorney Jacob Rothschild—the latter of whom has no known connection to the vaccine or mandates whatsoever, but whose last name conjures up Hitler’s antisemitic conspiracy theories that identified the family as one of the primary components of the Jewish cabal that Nazis believed secretly controlled the world.

The audience was a veritable showcase of the wide bandwidth of a far-right extremism. White nationalists from Nick Fuentes’ “Groyper army” (who have begun attaching themselves to anti-vaxx rallies as a way to recruit new followers) brought their “America First” banners. Proud Boys, who similarly have become a presence at COVID-denialism events, were also scattered throughout the crowd.

As Zachary Petrizzo of The Daily Beast reported, there were also lots of people out making money from the high percentage of hyper-gullible marks in the crowd:

The coalescence of the anti-vaccination movement with other far-right conspiracist movements—particularly the authoritarian QAnon cult—has been an ongoing phenomenon since COVID-19 broke out in 2020, and the radicalization of its believers has been gathering steam increasingly since. Likewise, the inherently violent nature of many of these movements has resulted in an increasing drumbeat of real-world violence directed at health care workers, local authorities, and anyone who supports the pandemic measures.

Along the way, it has spread globally. In Europe this weekend, similar anti-mandate demonstrations brought together the COVID conspiracists with neo-Nazis, white “identitarians,” and a broad array of other far-right extremists.

Some European anti-vaxxers have attempted to shut down vaccination sites by claiming they have a “crime number” for the site, meaning they’re supposedly under police investigation (they’re not). Some of them, claiming to be “common-law officers,” have attempted to arrest nurses, teachers, and even police officers. Much of their rhetoric echoes the American “sovereign citizen” movement.

As Amanda Marcotte observes at Salon, these previously diffuse movements are commingling into a perfect storm of unified right-wing extremism that runs from mainstream Republicans to smirking neo-Nazis, with consequences well beyond just the pandemic: