Jack Johnson easily heads the list, I've always been amazed that he wasn't strung-up by the KKK, or killed by a white supremist, et al.
Ali certainly had his share of hatred, but unlike Johnson, Ali was revered as much as he was hated, I never cared for him as a person, but damn he was fun to watch boxing.
Max Schmeling left for Germany after he lost to Louis in 1938, and although there was a lot of Anti-Nazi/German sentiment in America at the time, there was also quite a bit of pro-German/Nazi, sentiment. In 1938, the Nazi's were still a few years away from being rejected/hated in America and elsewhere in the world.
Contrary to popular belief, Schmeling was not nearly as hated as some in the media then and now would have you believe, and not all Americans were hoping that Louis would win the rematch. ( I hate revisionist history)
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