British Olympic athletes are being forced to sign contracts forbidding them from speaking out against the Chinese government, on threat of being banned from participating in the Beijing games. Other countries, including Canada and the US, have not made their athletes sign onto such an agreement, and have averred that their athletes can speak their minds. Prince Charles has vowed to boycott the Beijing Olympics.
The controversial decision to award the Olympics to Beijing means this year's Games have the potential to be the most politically charged since 1936.Link
Adolf Hitler used the Munich Games that year to glorify his Nazi regime, although his claims of Aryan superiority were undermined by black American athlete Jesse Owens winning four gold medals.