 Although the view of Earth's future as that of utopian communist society was the only welcome, the liberties of genre still offered a loophole for free expression.Books of brothers Arkady and Boris Strugatsky, and Kir Bulychev, among others, are reminiscent of social problems and often include satire on contemporary Soviet society.Ivan Yefremov, on the contrary, arose to fame with his utopian views on future as well as on Ancient Greece in his historical novels.