From the article....
QAnon is a violence-linked conspiracy theory based on cryptic posts to online message boards from an anonymous user known as “Q" that have spread rampantly on social media and among fringe right-wing media. QAnon conspiracy theorists essentially believe that President Donald Trump is secretly working to take down the purported “deep state,” a supposed cabal of satanic high-ranking officials, who they claim are operating pedophile rings. The FBI has labeled the conspiracy theory a potential domestic terror threat.