Rose Wilder Lane, Ayn Rand, and Isabel Mary Paterson each published philosophical works early that year. Lane's The Discovery of Freedom appeared in January 1943; Rand's The Fountainhead followed in April; Paterson's The God of the Machine came out in May. Three weird sisters in an antifeminist trifecta, they each celebrated in their books the strapping male as a hero, and exhibited a striking dissociation from what was happening around the world. Emphasizing free will as essential to liberty, the works laid the foundation for the libertarian political movement in the United States.