title: China to prosecute former party boss of Chongqing
text: BEIJING (Reuters) - The former Communist Party boss of one of China s most important cities, the southwestern megalopolis of Chongqing, has been expelled from the party and will be prosecuted for corruption, state news agency Xinhua said on Friday. Sun Zhengcai, a senior official once considered a contender for top leadership, had been party chief of the city until an abrupt announcement in July that he had been replaced by a rising political star close to President Xi Jinping. He was put under investigation later in July. 