• Zhou Yongkang, a State-level official, and Xu Caihou and Su Rong, both vice-State officials, were brought down.

• Former security chief Zhou was put under investigation for suspected "serious disciplinary violation" on July 29 this year, by the Central Committee of the Communist Party of China, in what could be China's biggest graft case in history.

Zhou, who was China's third most-powerful politician, served on China's Politburo Standing Committee – the highest decision-making body, until his retirement in Nov 2012.

• The Political Bureau of the Communist Party of China Central Committee expelled Xu, the highest military official in the previous Chinese leadership, for corruption on June 30. He has been transferred to military prosecutors for further investigation on bribery charges.

• Su has been removed from his post as vice chairman of the Chinese People's Political Consultative Conference (CPPCC) National Committee, according to a decision made at a CPPCC meeting on June 25. He was removed from his post as deputy to the National People's Congress (NPC), the country's top legislature on Sept 25.