Chinese courts sentenced two key allies of disgraced former security chief Zhou Yongkang to jail on Monday, one for 16 years and the other for 13, after finding them guilty of Corruption, the latest officials felled in a sweeping anti-Graft campaign.President Xi Jinping has spent the past three years waging war on deep-seated Corruption, saying it threatens the very survival of the ruling Communist Party.Scores of senior officials in the party, the government, the military and state-owned enterprises have been brought down, including Zhou, jailed for life in June after a secret trial in China's most sensational Graft scandal in 70 years.