Though he later became well known for his anticommunism, Heinlein in the late 1930s indulged in both leftist and isolationist politics. He sold his first science-fiction story in 1939 for $70, "and there was never a chance that I would ever again look for honest work." After Pearl Harbor, to his great disappointment, he was not called back into uniformed service. He ended the war at the Philadelphia Naval Aircraft Factory, working with fellow writers L. Sprague de Camp and Isaac Asimov.