A court in Shenzhen said today the four received prison sentences of up to five years each. The sentencing, following the high-profile temporary disappearance of five Hong Kong booksellers, raises questions about the semiautonomous territory's status as a free press haven for material banned on the mainland.
Two of those convicted in Shenzhen included Hong Kong magazine publisher Wang Jianmin and editor Guo Zhongxiao, who were arrested in 2014 in the border city, according to Hong Kong media.
Reports cited Wang's lawyers as saying their clients were not running a mail-order business and had sent only eight copies of the magazines to friends in China. Wang was also convicted on collusion and bribery charges.
Hong Kong has served for decades as a clearing house for information about sensitive mainland topics, and publishers once considered themselves beyond Beijing's reach.
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Publishers at an annual Hong Kong book fair, the largest of its kind in Asia, said this month that printers and distributors were increasingly unwilling to handle sensitive titles for fear of political repercussions.
The booksellers went missing one after the other, only to turn up months later under the control of mainland Chinese authorities. Four of the men have been released and a fifth is still detained.
The groups urged mainland authorities to "respect the rule of law and the principal of 'one country two systems,'" the agreement that outlines the former British colony's relationship with Beijing.