Incels. Anti Vaxxers. Conspiracy theorists. Neo-Nazis. Once, these groups all belonged on the fringes of the political spectrum. Today, accelerated by a pandemic, global conflict and rapid technological change, their ideas are becoming more widespread: QAnon proponents run for U.S. Congress, neo-fascists win elections in Europe, and celebrity influencers like Kanye West spread dangerous myths to millions. ‘Going Mainstream’ asks the question: What is happening here? Going undercover online and in person, UK counter-extremism expert Julia Ebner reveals how, united by a shared sense of grievance and scepticism about institutions, radicalised individuals are influencing the mainstream as never before.