Who: The IOC
Olympics: Stockholm 1912

If you think the International Olympic Committee is stupid now, know that it's a genetic condition. After Jim Thorpe, one of the greatest American athletes of the 20th century, won two gold medals in dominant fashion at the 1912 Games, he was stripped of his medals after it was discovered that he played professional minor league baseball. It took the IOC 69 years to finally correct the mistake, which was 30 years after Thorpe passed away.