IS ideology modern day fascism: Brandis

Attorney General George Brandis says Islamic State's medieval ideology has become the 21st century's fascism.

He said it wants to impose a religious dictatorship with no concept of the freedom of the individual, no respect for women and no respect for other religions.

"Let's call a spade a spade, (it) has become the 21st century's fascism," he told the Network Ten on Sunday.

Immigration Minister Peter Dutton told Sky News it was up to everyone to support moderate leaders so their voices of reason could be heard by young Muslim boys and girls as well as the broader Australian public.