The 1936 Berlin Olympics were heavily politicised by Hitler to promote the belief of white supremacy. That hilariously blew up in his face when African-American sprinter Jesse Owens annihilated the white sprinters (and sprinters of other colours) to win multiple golds.
Fun fact: Hitler didn't refuse to shake hands with Owens - he didn't congratulate any of the gold medal winners. But the US president refused to invite him to the WhiteHouse with other winners, or even send a congratulatory telegram. But hey, he was a democrat after all, what do you expect?
Fun fact II: the Nazi party copied a lot of their racist belief system from the US democratic party, but decided to tone it down because they thought it was a bit too strong. Think about that.