"Gernsback's most visible promotion device was the creation of the Science Fiction League, a quasi-fraternal national organization of science-fiction fans set up in local chapters. In later issues of the magazine [Wonder Stories] several pages were devoted to inspirational material about the league, chapter publicity, and similar matters. There were no dues, but paraphernalia was available from Gernsback - buttons, insignia, stationary, and other matters, on all of which Gernsback undoubtedly turned a profit. At an earlier date Gernsback had operated a similar club through his technical magazines."
"Gernsback's Science Fiction League seems to have peaked at about a thousand members while Wonder Stories was in existence. While it was directly and indirectly profitable to Gernsback, it also accomplished a fair amount in organizing science-fiction fandom, which had hitherto been sporadic and individual. Such organization had mixed results. On the one hand, it helped create an "esprit d'âme," if such a term be permitted; on the other hand it opened the way to the intense factionalism that has long been characteristic of science-fiction fandom."