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(CNN) -- Bo Xilai, the Chinese politician who fell from grace amid a dramatic political scandal, has been expelled from the Communist Party and relieved of his duties, according to China's state news agency Xinhua.

Bo once was considered a top contender for the Politburo Standing Committee, the team of nine politicians who effectively rule China. China's Communist Party is expected to meet at its 18th National Congress next month to announce who'll occupy the top positions.

He is a charismatic, albeit controversial, politician who launched a "smashing black, singing red" campaign in the southwestern city of Chongqing that promoted Communist ideology and zealously cracked down on organized crime.

His economic programs, which included millions spent on social welfare, made him a popular leader in Chongqing. But analysts say his populist policies and high-profile personal style were seen as a challenge to the more economically liberal and reform-oriented faction that dominates the current party leadership.