What Happens When QAnon Seeps From the Web to the Offline World

What began online more than two years ago as an intricate, if baseless, conspiracy theory that quickly attracted thousands of followers has since found footholds in the offline world. QAnon has surfaced in political campaigns, criminal cases, merchandising and at least one college class. Last month, hundreds of QAnon enthusiasts gathered in a Tampa, Fla., park to listen to speakers and pick up literature, and in England, a supporter of President Trump and the Brexit leader Nigel Farage raised a “Q” flag over a Cornish castle.

About a dozen candidates for public office in the United States have promoted or dabbled in QAnon, and its adherents have been arrested in at least seven episodes, including a murder in New York and an armed standoff with the police near the Hoover Dam. The F.B.I. cited QAnon in an intelligence bulletin last May about the potential for violence motivated by “fringe political conspiracy theories.”

Matthew Lusk, who is running unopposed in the Republican primary for a Florida congressional seat and openly embraces QAnon, said in an email that its anonymous creator was a patriot who “brings what the fake news will not touch without slanting.” As for the theory’s more extreme elements, Mr. Lusk said he was uncertain whether there really was a pedophile ring associated with the deep state.

“That being said,” he added, “I do believe there is a group in Brussels, Belgium, that do eat aborted babies.”