The Communist Party's anti-graft agency began its plenary session in Beijing yesterday, with President Xi Jinping expected to shift the focus of his corruption crackdown to factions and organised graft within the party's ranks this year. Political pundits are closely watching the Central Commission for Discipline Inspection's three-day meeting, which will likely report on the progress of Xi's campaign and lay out ways to sustain it. Beijing-based political analyst Zhang Lifan said the campaign's focus this year would be on party factions. Earlier this month, state mouthpiece Xinhua made a rare acknowledgement of factions in the party, naming several disgraced senior officials connected to the so-called Shanxi, Secretary and Petroleum gangs. Last year, the graft-buster netted four national-level officials - former security tsar Zhou Yongkang , former presidential aide Ling Jihua , former Central Military Commission chairman General Xu Caihou , and former Chinese People's Political Consultative Conference vice-chairman Su Rong . A total of 68 provincial-level officials were also put under investigation. Ling is accused of heading the "Shanxi Gang", a corrupt network of officials and businessmen from the province. "Just as previous plenums showed the leadership's determination to tackle graft, so this plenum will focus on ensuring the anti-graft drive is sustainable," Professor Wang Yukai, of the Chinese Academy of Governance, told China News Service. The top leadership would have to use all its experience gained from felling so many "tigers" and "flies" over the past two years, he said. Tigers and flies refer respectively to those powerful leaders and lowly bureaucrats who are corrupt. As the crackdown continues, mainland media have exposed more secret connections. Liberal magazine Yanhuang Chunqiu recently revealed that disgraced deputy naval commander Wang Shouye allegedly had the backing of a CMC leader's personal secretary. While the secretary was not named, he is widely believed to be Jia Tingan , former secretary of ex-president Jiang Zemin . Both Wang Shouye and Jia are Henan natives.