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The biggest scandal in Super Bowl history is of course the Baltimore Colts throwing the Super Bowl to the New York Jets in 1970. Heavy favorites, the Colts were instructed to throw the game by their owner Carroll Rosenbloom who was the most notorious gambler in the history of the NFL. Rosenbloom owed over two million dollars in the bets and vig to Carlo Gambino and was instructed to let the Jets cover. So he spread some money around to some of his players to make them throw the game. Unfortunately for him, his main co-conspirator Johnny U had been injured and the very upright Earl Morrall who was as his name suggests very moral and was quarterbacking the team. Now Rosenbloom knew that no one with a hair cut like Morrall would ever throw a game so he arranged for him to be injured so Johnny U could go in to make sure that the Jets covered the spread. Little did he know that Johnny owed his own debt to Vito Genovese to cover his habit and when he finally got in the game he made sure that the Jets won outright.
(Reverse the Call on the Field, The Secret History of the NFL, Doris Kearns Goodwin, ESPN Press 2010)