Had his Olympic medals stripped from him because he had played a few semi-pro baseball games. While under the Olympic rules of the time, its hard to take issue with that decision, (although its worth noting that the IOC ignored its own rules regarding timeframe for challenges of amateur eligiblilty) it's extremely hard to say that Thorpe, who was a dedicated athlete and a pretty decent man, dishonored anything.
Thorpe is often considered, with considerable justification to be the greatest athlete of the first half of the 20th century and high in the running for the best of the entire hundred years. He was treated shamefully at times, but there is no evidence that he responded in kind.
