Robert Anton Wilson was a notable Anarcho-capitalist/Libertarian writer, noted for his works in the areas of Science Fiction and Conspiracy Theory. The Illuminati often played an important role in his writings, usually as the villains, and often opposed by the Discordians.
Notable works
Alleged Fiction
The Illuminatus! Trilogy The Schrodinger's Cat Trilogy
Alleged Fact
Cosmic Trigger: Final Secret of the Illuminati Prometheus Rising