In 1973, Shanmugathasan's party was estimated by the US State Department to have approximately 500 to 800 cadre, and possessed "the ability to control the Ceylon Trade Union Federation and the Ceylon Plantation Workers' Union with a combined membership of some 110,000".
1973年，美国国务院估计该党拥有约500至800名干部，并拥有“控制锡兰工会联合会和锡兰种植园工会的能力，其成员总数约为11万”。