蒋彦永 (Jiang Yanyong) is a Chinese physician from Beijing who publicized a coverup of the Severe Acute Respiratory Syndrome (SARS) epidemic in China in 2003. Jiang was the chief physician of the 301* Military Hospital in Beijing.

Why it is blocked: The CCP had imposed a media blackout on SARS reporting since the first reported cases in late 2002. Jiang’s decision in April 2003 to email revelations about the severity of the crisis to the media and the subsequent leaking of the memo to Time caused him to be detained by the state. He re-entered the spotlight in 2009 when he submitted a letter to Hu Jintao demanding an apology as well as a re-examination of the 1989 Tian'anmen crackdown.

*301 in Chinese characters (三〇一) is also blocked. However, “301” and “三零一” (with the alternative Chinese method for writing the digit “0”) are unblocked.