It is considered a daring move in Chinese political circles.
A group of party veterans have taken the rare step of writing an open letter to president Hu Jintao calling for the removal of one of the country's most powerful men.
Zhou Yongkang is in charge of China's police, courts and spy network.
Some party members accuse Zhou of implementing hardline policies reminiscent of the Mao Ze dong era.
Al Jazeera's Rob McBride is monitoring developments from Hong Kong.
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