"A former member of China's all-powerful Politburo Standing Committee, <a href=""http://edition.cnn.com/2015/06/11/asia/china-zhou-yongkang-sentence/"">Zhou</a> <a href=""http://cnn.com/2015/06/11/asia/china-zhou-yongkang-sentence/"">Yongkang is now serving a life sentence </a>for corruption and other crimes. He was tried in secret in May 2015 and sentenced to life in prison in June. He's the highest ranking official to fall victim to Xi's graft crackdown."