JRR Tolkien, The Lord of the Rings. Its major theme is the necessary corruption that comes from the power of the state and central planning - a power which cannot be harnessed for good, but only for evil. Tolkien was, of course, a customary law anarchist.
Good libertarian fiction? How about we start with Human Action! Hahahaha. Sorry, I’ve been hanging around /r/politics too much. The mudslinging is just horrendous.
Henry Hazlitt’s Time Will Run Back, where a man who is thrust into the role of communist dictator sees first hand the problems of central planning. He tries to solve the problem by dismantling it piece-by-piece and replacing it with a market system. He discovers, in stages, that free markets solve the economic calculation problem that cripples central planners.
Full Asylum by Michael Isenberg (http://www.FullAsylum.com) It’s a dark comedy that takes place a few years in the future when the Nanny State is out of control and government CREEPS are ready to kick in our doors. Ends with a confrontation between an ordinary citizen and the Attorney General.