Joe Gans admitted to being involved in two fakes in his career, the Terry McGovern and Jimmy Britt fights.
The following quote is from from the Monte Cox artcle on Gans:
"Gans went down several times against McGovern without being hit. The Dec 14 Chicago Record Herald reported that the “Bout Has Suspicious Look.” The fight's referee George Siler, one of the best and most well known 3rd men of the period, wrote in Dec 14 Chicago Tribune "If Gans was trying last night then I don't know much about the game." Such uproar occurred because of the obvious dive that Chiacago's Mayor Harrison banned boxing in the city, a ban that lasted well into the next decade."
Now, here is a copy of the fight http://youtube.com/watch?v=DeQGaNDNi78
Now the film quality isn't the greatest but to me McGovern appears to land some solid punches which put Gans down and Gans appears to be genuinely hurt. In addition, if Gans intention was to purposely lose by KO, why didn't he stay down after one of the earlier knockdowns? By rising time and time again, (in McGovern's path who stood immediately over top of him) he put himself in legitimate risk.
Real or Fake? Be the judge.