A normally staid media exhibition in Tehran turned into a site of frustration for the supporters of Mir Hossein Mousavi and other Iranians who object to the election of Mahmoud Ahmedinejad this summer. An opposition candidate and Mousavi aide were rough up by pro-government thugs over the weekend. A woman loudly protested a government exhibit on the election. Authorities closed the expo without warning on Monday, leaving large crowds waiting outside. In a guest book for the government-sponsored publication "Iran," one visitor left this message: "You are the symbol of censorship."