Well, there have been A LOT, and I mean a lot, of controversies during the Olympics. For a start, Germany was once refused entry after World War One. Also, there were all sorts of problems like women weren't allowed to enter, and also, black people weren't allowed to enter either.
Of course, there are a LOT more but I'm typing this off memory so, there are a few! :)
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the fact that the whole Olympics team for china was under-age and china made them passports that said they were 16
There were terrorist problems once. They had to cancel the Olympics for the year. I believe that it was a European country. (Not much info, but I hope it helped)