Kim Stanley Robinson's 'Red Mars' is also part of this genre. It explores the colonization of Mars from a perspective that questions corporate and state power, and also looks at issues of environmental preservation and social justice on the new planet.
Ursula K. Le Guin's 'The Dispossessed' is a great example. It tells the story of a planet where people live in a communal, anarchist society in contrast to a more capitalist - like neighboring planet.", "Answer2: "Octavia Butler's 'Parable of the Sower' can be considered leftist science fiction. It deals with issues such as race, class, and environmental collapse, and shows how a young woman tries to build a new community based on her own vision of a better future.