The Communist Party has long striven to control freedom of speech in China. Websites from around the world are blocked. Major social media cannot be accessed, and advanced software is used to delete “sensitive” entries from the Internet. Domestic journalists who step over the invisible line of what’s permissible face being fired or even arrested, while foreign journalists face various forms of government intimidation. How reporters are trying to work around China's resurgent censorship, 25 years after Tiananmen.