Heart of a Dog
Two notable exclusions from Soviet 'Wellsian' tradition were Yevgeny Zamyatin, author of dystopian novel "We" (1924), and Mikhail Bulgakov, who contributed to science fiction with "Heart of a Dog" (1925), "The Fatal Eggs" (1925) and "" (1936). The two used science fiction for social satire rather than scientistic prediction, and challenged the traditional communist worldview. Some of their books were refused or even banned and only became officially published in the 1980s. Nevertheless, Zamyatin and especially Bulgakov became relatively well-known through circulation of fan-made copies.