C. M. Kornbluth (1923–1958)
Although as a young man Kornbluth held leftist political views, he grew to share Rothbardian-style sentiments about the state. To Kornbluth the state was obviously just another criminal gang. His book The Syndic won the Libertarian Futurist Society’s Prometheus Hall of Fame Award in 1986.
Libertarian science-fiction fans under 40 are probably at least a little unclear on just who or what the Futurians were.