Hayduke is a term and verb used among environmental activists and people who cite cult "revenge" books. It is the name of George Washington Hayduke, a fictional character based on Edward Abbey's friend Doug Peacock in Abbey's cult classics The Monkey Wrench Gang and Hayduke Lives!. The Hayduke character personified the "no compromise in defense of the Earth" approach to environmentalism, made real in early Earth First! activism.
A complete series of revenge books using the pseudonym George Hayduke exist, mostly published by the Paladin Press, including The Big Book of Revenge, Get Even, Make 'Em Pay, Up Yours and Screw Unto Others. Each describe various methods of committing mischief and mayhem against those who have wronged others in a manner reminiscent of The Anarchist's Cookbook. "Haydukery" refers to committing such acts in general.
See also Haiduk, referring to outlaws, highwaymen or freedom fighters in the Balkans, Central- and Eastern Europe.