BEIJING — About once a month, Hao Jian is politely asked by the police “to have a cup of tea.” He knows it wouldn’t be prudent to say, “No thank you.” A government critic and professor at the Beijing Film Academy, Mr. Hao signed Charter 08, a 2008 manifesto modeled on Charter 77, the 1977 document that helped usher in the end of one-party rule in Czechoslovakia. He has participated in forums about
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