When the coronavirus began to spread in Wuhan, a doctor named Li Wenliang issued the first warning about an outbreak. Chinese authorities responded by showing up at his house in the middle of the night and forcing him to sign a document stating that he had broken the law by spreading rumors online. Dr. Li later died from the virus he had warned about. But Dr. Li isn’t the only voice China has attempted to silence as it tries to maintain control over information about the virus.When the outbreak began, a video blogger named Chen Qiushi went to the...