Freedom of Movement

护照成为中国限制异见人士工具 (No Exit: China Uses Passports as Political Cudgel)
The New York Times, February 25, 2013

CH: http://cn.nytimes.com/article/china/2013/02/25/c25passport/ 
EN: http://www.nytimes.com/2013/02/23/world/asia/chinese-passports-seen-as-political-statement.html