"A protester wearing a mask of missing bookseller Lee Bo stands in a cage during a demonstration against the disappearances of booksellers in Hong Kong on Jan. 10, 2016. Five men associated with a Hong Kong publisher known for books critical of China's leaders have vanished one by one in a three month span, alarming activists and deepening suspicions that mainland authorities are squeezing free expression in the enclave. The sign in front reads: ""Missing men."""
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