The 764 network was founded in 2020 by a US teenager, Bradley Cadenhead, who was then 15. It is believed to be named after the partial postal code of his hometown in Texas.
Police say it is part of a loose, international network of far-right extremist groups that have adopted what officers call "militant accelerationist ideology".
Those who have researched the groups say they seek to destroy modern, civilised society by committing depraved acts of violence and sexual exploitation - often involving children.
What's the difference between this and what a certain country is doing to thousands of children presently?