The Futurians were based in New York.
As described in Isaac Asimov's autobiography In Memory Yet Green, the Futurians spun off from the Queens Science Fiction Society (headed by Sam Moskowitz, later an influential SF editor and historian) over ideological differences. Asimov does not specify the differences but hints that they were political in character. Other sources indicate that Donald A. Wollheim was pushing for a more left wing direction with a goal of leading fandom toward a political ideal, all of which Moskowitz resisted. As a result, Wollheim broke off and began the Futurians.
Members of the Futurians included
Books on the Futurians: