Margaret Killjoy is an American author, podcaster, and anarchist activist known for her speculative fiction exploring radical politics and community resistance. She writes the Danielle Cain series, which includes the novellas "The Lamb Will Slaughter the Lion" and "The Barrow Will Send What It May," blending folk horror with anarchist themes as traveling activist Danielle encounters supernatural forces in autonomous communities. Her work also includes "Into the Gray," a dark fantasy novella. Beyond fiction, Killjoy hosts the podcast "Live Like the World is Dying" and has been involved in various DIY publishing projects, bringing countercultural perspectives to genre literature.