Bo Xilai and Zhou Yongkang purges (2012-2015)
The party expelled Politburo member Bo Xilai in 2012 over the murder of a British businessman and corruption, then broke with precedent in 2014 by expelling former security chief Zhou Yongkang, the first sitting Politburo Standing Committee member to fall. Both were tried and given life sentences.
The cases established that no rank was formally off limits and gave the anti-corruption campaign its public template.
Removals of senior officials became routine party business rather than exceptional events.
The fifth plenum's 33 expulsions are the same mechanism at larger scale: discipline cases ratified in bulk at a leadership meeting.
