This thesis is an analysis of the communist infiltration and movements is Thailand and Governments’ policies pertaining to this matter during 1925 – 1957. The thesis is devided into 6 chapters as briefly discussed below :- the first chapter analyzes principles and methods of socialism and communism from the inception of this ideology up to the Third International. The second chapter discusses the causes of communist ideological expansion and subsequent movements in Thailand starting from the reign of King Rama VII. Government’s policy and policy measures against communism are also studied and analyzed in this chapter. The analysis of communist and socialist movements after the 1932 coup up to W.W. II as well as government’s policy and measures against such threat are presented in the third chapter. The fourth chapter analyzes communist movements, infiltration and pressure, both internally and externally, upon the Thai governemnts after W.W. II up to the 1957 Revolution. It also includes the study of movements on the part of the politicians whose political orientation was supportive to the socialist cause. Specific policy and policy measures of the Pibul government against communism and socialism are outlined in chapter 5. The concluding chapter presents an overall analysis of the communist problem as well as the governments’ policies against such problem during 1925-1957. The findings are as followes:- Although Thailand had been facing the communist infiltration and threat since 1925, the communist problem, during this period, was not so serious and did not greatly affect national security, neither did it have any impact upon other important institutions. This is due to the fact that every government had successively developed policies and measures against communist movements. Furthermore, the general situations of the Thai Society were not yet conducive to the growth and expansion of communist doctrine which made it very difficult for communist agents to persuade and recruit the Thai populace. However, the communist problem is still in existence and may be more widespread since most of the people in the rural areas are still very poor and deprived, they are uneducated and other public amenities such as roads and public health services are, at present, far from adequate.
