Breivik is similar in some respects to the "Unabomber," Ted Kaczynski, who sent parcel bombs to university professors and corporate executives.

The Norwegian also has much in common with Mohammed Atta, the man who crashed the plane into the North Tower of New York's World Trade Center during the attacks of Sept. 11, 2001. Like al-Qaida terrorists, Breivik wanted to impose a world of rigid, backward morality in which women are subservient, children can be severely disciplined, and God the Almighty has decreed that men should rule.