...Leaving aside the very worthy but to my mind journalistic The Dispossessed by U.K. Le Guin, it is quite hard for me to find many other examples of sf books which, as it were, 'promote' libertarian ideas. M. John Harrison is an anarchist. His books are full of anarchists -- some of them very bizarre like the anarchist aesthetes of The Centauri Device. Typical of the New Worlds school he could be described as an existential anarchist. There is Brian Aldiss with his Barefoot in the Head vision of an LSD 'bombed' Europe almost totally liberated and developing bizarre new customs. There are J. G. Ballard's 'terminal ironies' such as The Atrocity Exhibition and Crash and so on, which have brought criticisms of 'nihilism' against him. There is Joanna Russ's marvellous The Female Man. So little sf has fundamental humanitarian values, let alone libertarian ideals, one is hard put to find other examples...