"The Marching Morons" is a look at a far future in which the world's population consists of five billion idiots and a few million geniuses – the precarious minority of the "elite" working desperately to keep things running behind the scenes. "The Marching Morons" is a direct sequel to "The Little Black Bag": it is easy to miss this, as "Bag" is set in the contemporary present while "Morons" takes place several centuries from now, and there is no character that appears in both stories. The titular black bag in the first story is actually an artifact from the time period of "The Marching Morons": a medical kit filled with self-driven instruments enabling a far-future moron to "play doctor". A future Earth similar to "The Marching Morons" – a civilization of morons protected by a small minority of hidden geniuses – is used again in the final stages of "Search the Sky".
Cyril M. Kornbluth grew up in Inwood in New York City. As a teenager, he became a member of the Futurians, the influential group of science fiction fans and writers. While a member of the Futurians, he met and became friends with Isaac Asimov, Frederik Pohl, Donald A. Wollheim, Robert A. W. Lowndes, and his future wife Mary Byers. He also participated in the Fantasy Amateur Press Association.
Kornbluth served in the US Army during World War II (European Theatre). He received a Bronze Star for his service in the Battle of the Bulge, where he served as a member of a heavy machine gun crew. Upon his discharge, he returned to finish his education, which had been interrupted by the war, at the University of Chicago. While living in Chicago he also worked at Trans-Radio Press, a news wire service. In 1951 he started writing full time, returning to the East Coast where he collaborated on a number of novels with his old Futurian friends Frederik Pohl and Judith Merril (as Cyril Judd).
He used a variety of pen-names: Cecil Corwin, S. D. Gottesman, Edward J. Bellin, Kenneth Falconer, Walter C. Davies, Simon Eisner, Jordan Park, Arthur Cooke, Paul Dennis Lavond and Scott Mariner.