Ronson Chan, in gray mask, outside a police station in Hong Kong on Monday. HONG KONG—Police on Monday charged the head of Hong Kong’s largest journalist group with obstructing police officers, the highest-profile prosecution of a press worker in recent months following a sustained crackdown on the city’s pro-democracy media. The charge against Ronson Chan, chairman of the Hong Kong Journalists Association, comes about two weeks after his arrest while covering a meeting of owners of a housing estate in the northern Hong Kong neighborhood of Mong Kok.

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