Analysis | Xi Jinping strengthens his grip with Zhou Yongkang takedown ... but what next?
Taking down a party heavyweight has given the president clout not seen since Deng Xiaoping and energised his anti-graft fight, analysts say
With the launch of the formal investigation into former Politburo Standing Committee member Zhou Yongkang, President Xi Jinping has consolidated power in a way that eluded his predecessors.
Xi would have needed a strong consensus among retired and sitting party elites before moving forward with the probe, which marks the first time a Standing Committee member or ex-member has been investigated for "serious violation of disciplines" since the opening up era of the late 1970s.
Although the case sends a message the party will not hold anyone above the law, other past and current members of the committee were unlikely to become a focus of Xi's anti-graft campaign, analysts said.
The president remains limited by the principle of collective leadership, which arose under Deng Xiaoping as a way to end the political chaos of the Cultural Revolution.
But a single case, especially one so high-profile, is enough for Xi, who is the general secretary of the party, to reinforce his message party stars can no longer use their power bases and state-owned firms to accumulate massive wealth - all with impunity.
Watch: China's Xi cementing power with probe into Zhou: analyst