1980 Summer Olympics
Polish gold medallist pole vaulter Władysław Kozakiewicz showed an obscene bras d'honneur gesture in all four directions to the jeering Soviet public, causing an international scandal and almost losing his medal as a result. There were numerous incidents and accusations of Soviet officials using their authority to negate marks by opponents to the point that IAAF officials found the need to look over the officials' shoulders to try to keep the events fair. There were also accusations of opening stadium gates to advantage Soviet athletes, and causing other disturbances to opposing athletes.