Breivik changed a Kaczynski screed on leftism and what he considered to be leftists' "feelings of inferiority" - mainly by substituting the words "multiculturalism" or "cultural Marxism" for "leftism." For instance, Kaczynski wrote: "One of the most widespread manifestations of the craziness of our world is leftism, so a discussion of the psychology of leftism can serve as an introduction to the discussion of the problems of modern society in general."
Author: Edecio Martinez
Credit: Rex Features/AP Images