THE wife of ''black-hand'' dissident Chen Ziming has petitioned the National People's Congress for the early release of her husband. Ms Wang Zhihong recently sent a letter to the congress asking that Chen, who was given a 13-year jail term in 1991, be paroled for medical treatment. The same petition was also forwarded to the Chinese People's Political Consultative Conference. The letter said Chen had contracted a skin disease and other illnesses in jail. It added that he had behaved well in prison, where he was conducting research in Chinese history. ''Chen Ziming is merely an intellectual and he poses no threat to anyone. I hope that based on humanitarian reasons, he could be paroled or released to receive medical treatment,'' Ms Wang wrote. Meanwhile, Mr Bao Zunxin, a former researcher of China's Academy of Social Science in Beijing, has sent a petition to the Beijing People's Congress asking that he be reinstated in his old job. Mr Bao was paroled last November after having been jailed for three years for his involvement in the 1989 democracy movement. The letter said in spite of intervention by the Beijing Labour Reform Bureau and Ministry of Justice, the academy refused to re-employ him. Mr Bao claimed it had breached the constitution by rejecting his bid for re-employment.