IMO, a precedence of charging people in the senior level at more mundane crime than concubines or simple corruption.
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The shock of the Chinese announcement — claiming that a member of the ruling elite was linked through his wife to a possible murder, and that the killing grew out of private business interests of the kind that have made many Chinese officials rich — had far-reaching implications for the way that China is governed.
http://www.nytimes.com/2012/04/11/world/asia/detained-party-official-facing-ouster-from-politburo.html?_r=1&ref=world