 Yeung organised serious terrorist attacks in Hong Kong, including assassinations and the setting up of bombs, which lead to the death and injury of many people in Hong Kong.Born in 1926, Yeung became a member of the Hong Kong Tramways Workers Union in 1948 and led strikes by Hong Kong Tramway's fare conductors the following year.He served as chairman of the Hong Kong Federation of Trade Unions (FTU), the largest pro-CPC labour union in Hong Kong, from 1962 to 1980, and then its president between 1980 and 1988.