Watch the full 47 minute documentary broadcast on BBC News and iPlayer here.

On 6 January 2020 supporters of outgoing US President Donald Trump stormed the US Capitol. Many of them were followers of the QAnon conspiracy theory, which saw Trump as a hero who would defeat a Satan-worshipping global cabal. A survey by the polling organisation Ipsos Mori has found that 7% of Americans still believe this conspiracy theory. So who are these people? The BBC’s Stephanie Hegarty travelled to the US to find out .