After his release, he worked as a construction worker from 1981 to 1986. In 1986, Leung worked for Kowloon Motor Bus as an overnight vehicle cleaner. Around 1988, he formed the April Fifth Action after the Revolutionary Marxist League was disbanded. The group is well known for its aggressive and civil disobedience-style actions to protest against the governments of China and Hong Kong during celebrations and visits of state leaders, often resulting in confrontations with the Hong Kong police. They usually carry a coffin as their trademark protest prop. Leung supported the Tiananmen protest of 1989 and has been member of the Hong Kong Alliance in Support of Patriotic Democratic Movements in China.