Since the movement's emergence in 2017, adherents of the QAnon far-right conspiracy theory have been involved in a number of controversial events, some of them violent, resulting in the filing of criminal charges and one conviction for terrorism.

QAnon is a far-right American political conspiracy theory and political movement that originated in 2017. QAnon centers on fabricated claims made by an anonymous individual or individuals known as "Q". Those claims have been relayed and developed by online communities and influencers. Their core belief is that a cabal of Satanic, cannibalistic child molesters is operating a global child sex trafficking ring that conspired against president Donald Trump. QAnon has direct roots in Pizzagate, an Internet conspiracy theory that appeared one year earlier, but also incorporates elements of many other theories. QAnon has been described as a cult.