 From 1973 to 1987, he was a local deputy to the National People's Congress.During the 1967 Hong Kong riots, which was inspired by the Cultural Revolution and escalated from a labour dispute at a plastic-flower factory in San Po Kong, Yeung served as director of the Hong Kong and Kowloon Committee for Anti-Hong Kong British Persecution Struggle.Thousands were injured and 51 died, 15 of whom were killed in bombings planted by the Leftists.