Who: Antonio Pettigrew
Olympics: Sydney 2000

Antonio Pettigrew cost his relay team gold medals when he revealed that he used performance enhancing drugs for the 2000 Games. Michael Johnson, one of the greatest American sprinters of all time, voluntarily gave back his medal when he learned of the news. Two other members of the team, twin brothers Alvin and Calvin Harrison, also faced doping allegations in the following years. If the IOC can take away medals, shouldn't the MLB do something about all of those home run records?