Historians of Cold War international relations have rarely discussed the significance of social democracy in an international context. Recent exceptions have shed light on the non-communist socialist internationalism within Europe, focusing on the Socialist International (SI), yet little is known about the fact that the social democratic network was not limited to Europe but expanded globally. In addition, historians of modern Japanese politics have not paid much attention to the Japan Socialist Party (JSP)’s relations with international social democratic networks, to which the JSP attached great importance.
To fill these gaps, this article deals with the JSP’s relationship with the organization of West European social democratic parties—the SI and its predecessor Comisco—in the late 1940s and the early 1950s. It argues that the JSP’s so-called ‘peace debate (kōwa ronsō)’ of the same period, in which they fought over Japan’s postwar peace treaty and security pact with the US, was greatly influenced by the Cold War policies of Comisco/the SI.
Among the main factions of the JSP, the rightists, who supported pro-West Cold War policies, wished to promote cooperation with European socialists due to their ideological proximity and the need to compete with the leftists, who tended to be neutralists in the East-West conflict. As a result of the rightists’ effort, the JSP was admitted to Comisco in 1950.
Comisco published its first official statement on international security, the ‘resolution on socialism and peace,’ in June 1950. Then the JSP, especially the rightists, began to refer to Comisco’s international policy in the intra-party ‘peace debate,’ which was ignited by the outbreak of the Korean War. Specifically, Comisco and the JSP rightists supported the central role of the United Nations in international peace and advocated anti-communism and pro-West position in the Cold War.
Comisco was reorganized into the SI at the Frankfurt Congress in the middle of 1951, where they published a statement prioritizing military defense against communist aggression. Taking advantage of the SI’s prestige, the rightists succeeded in forming a partnership with the centrists, declaring to support the SI’s Cold War policy. However, disappointed with the SI, the leftists began to approach Asian socialists, many of whom supported neutralism in the Cold War, resulting in the foundation of the Asian Socialist Conference. Failing to compromise, the JSP was split into two parties in October 1951.
In short, the JSP’s intra-party controversy was about defining ‘social democratic foreign policy’ in the Cold War, and the same question caused friction among non-communist socialists across the world. In this sense, the JSP’s left-right dispute was in the context not only of Japanese political history but also of the history of global social democratic network in the Cold War period.
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