But in every related article? What does it have to do with the Wikimedia Foundation? Does it need to be in Wikipedia's article, History of Wikipedia article, Wikipedians With Articles article (or is it a list?), Jimmy Wales' article, Larry Sanger's article, Citizendeium's article, the Essjay Controversy article.
You have two options that I can see. Give a brief description of the dispute (one or two sentences) or say something quite vague and undisputed ("[[Larry Sanger]], who was with Wikipedia from the beginning, ...") and let the reader follow the link if they want to know more.