Boris Onischenko: Montreal, 1976 Nationality: Russian
Onischenko went up against Team GB in the 1976 Montreal Games, but the British team complained that one of his points was won without contact being made.
In fencing, the tip of the sword must be flattened with a force of 750 grams to complete a circuit. Onischenko's sword had been modified so he could complete a circuit without making contact. He was disqualified for cheating, stripped of his previous medals, and banned from competing in the future.