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China's gossipy internet forums traded rumours that Mr Zhou and Mr Bo intended to stage a coup in Beijing, though the truth of that situation was never revealed.
BBC: China leaders reassert control over security portfolio
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Mr Zhou, who is said to have backed Mr Bo to succeed him, has presided over heady days for the men and women in blue (and plainclothes).
ECONOMIST: China��s security state
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Mr Zhou's record, damaged by his links to Mr Bo, was further besmirched in April, when Chen Guangcheng, a blind legal activist, escaped from his home in Shandong province, where he was being detained illegally by the authorities.
ECONOMIST: China��s security state