SA, 10:40: conspiracy theories are usually a right-wing thing. The right is more anti-science in general, as it has to be really, eg. global warming denial, pandering to religious fundamentalism etc.
There was an exception to this as some on the left in the anti-war movement began accepting 9/11 Twin Tower demolition theory, and I expect this served as the tiny grain of truth in the “anti-Semitism in the Labour Party” hoax. I didn’t realise for years that Twin Tower demolition theory had been promoted from very early on by anti-Semites such as Holocaust denier Victor Thorn, Barnes Review etc.