In 2000, Chung wrote an academic article stating that he felt pressure to stop conducting public opinion research polls.
From 1993 to 1994, Chung served as a part-time community panellist of the Central Policy Unit of the Hong Kong Government.
Internationally, he has been the Hong Kong representative at the World Association for Public Opinion Research (WAPOR) for a number of years.
[5] Although the allegations were denied by Tung and HKU, controversy erupted over the question of political interference in academic freedom.
HKU set up a three-member panel led by Justice Noel Power to investigate Chung's claims.
After 11 days of open hearings in August, the panel concluded that there were what it called "covert attempts" to pressure Chung into discontinuing his polls.