This study identifies the special organizations, secret members, and entities involved in the expansion and reinforcement of the Progressive Party's organization in the 1950s. It was intended to examine the relationship between the organization and activities of the Progressive Party's special organization, especially the Yeomoung association, with the student movement developed in the 1960s. In order to secure popular organizations and expand the party's power, the Progressive Party attempted to organize a special party centered on activities by region and region. the Yeomoung association of the Progressive Party sought to bring students from each university gradually to the Progressive Party through a 'human network'. The secret members of the progressive party were those who would join the progressive party in political resistance to the Rhee Syng-man regime. The Rhee Syng-man regime's dissolution of the Progressive Party in a month after the “Progressive Party Incident” was intended to induce withdrawal of support from the Progressive Party through psychological fear as well as wary of secret members, or “people who act as party members.” After the Progressive Party case, the Progressive Party's influence was thought to have ended, but it was leading to the student movement in the 1960s due to the horizontal link, the “human network.”