Cory Doctorow

...In 2001 the FBI imprisoned Russian programmer Dmitry Sklyarov the day after he gave a presentation at a Def Con hacker conference demonstrating the incompetence of Adobe's e-book protection. Charges were eventually dropped, but on Sklyarov's return to Russia, the Russian government issued a warning to its scientists to steer clear of American conferences, as we'd (the United States) turned into the kind of nation that threw people in jail for talking about math.