Tanong played an important role in negotiating with the government of Prime Minister Chatichai Choonhavan to secure the creation of a comprehensive national social security system.Amnesty International Thailand : The disappearance of labour leader Tanong Pho-arn 19 June 1991 AI Index : ASA 39/007/2001 released 18 June 2001 He was also a Thai Senator and the Vice-President of the International Confederation of Free Trade Unions - Asia Pacific Regional Organization ( ICFTU-APRO ) .