Kokurō was established in February 1946 in preparation for the establishment of the nationwide, state-run railway
Japan National Railways (JNR), organizing more than 96% of JNR employees. Originally a confederation of local and regional unions, Kokurō was reorganized into a single organization in June 1946. In early 1946, the newly legalized
Japan Communist Party sought to establish a rival labor movement to the more conservative
Sōdōmei federation. To this end, it began to infiltrate the upper ranks of major labor unions, including Kokurō. In August 1946, Kokurō became one of the founding member unions of the new, JCP-backed
Sanbetsu labor federation. In these early phases, the
American Occupation authorities even encouraged the formation of Sanbetsu, believing it to be a necessary counterweight to
Sōdōmei, which they viewed as having been too compliant with the militarist Japanese government's demands in the prewar period. However, in the late 1940s, with advent of the global
Cold War, Occupation authorities began to view the activities of the militant Sanbetsu-affiliated labor unions with increasing alarm. With the open encouragement of Occupation authorities, more conservative elements within the Sanbetsu-affiliated labor unions began to form “democracy cells” (
mindō). The first of these mindō was formed within Kokurō, with other unions rapidly following suit and forming their own mindō thereafter. Amidst the collapse of Sanbetsu during the
Red Purge of 1950, these mindō rose to the fore and merged with some elements of Sōdōmei to form the new
Sōhyō labor federation, with Kokurō as a leading member. In 1959, Kokurō's dissatisfaction with Sōhyō's seeming lack of militancy was a factor in driving Sōhyō's leadership to pursue an activist role in the massive
1960 Anpo protests against the
U.S.-Japan Security Treaty. However, an Occupation-era law prohibiting public-sector unions such as Kokurō from carrying out strikes limited Kokurō's own militancy and forced it to rely on the broader Sōhyō federation (which including many private-sector unions as well) to advance its militant agenda. Kokurō finally tried to resolve this situation by carrying out a “Strike for the Right to Strike” (
sutoken suto) in 1975, but the strike ended in failure and shattered the power of Kokurō, leading to a decline in membership and ending its days as an effective organizing force for labor militancy. By the 1980s, Kokurō was a shadow of its former self. When the privatization of JNR was proposed in the mid-1980s, Kokurō was strongly opposed and campaigned against it, but to no avail. JNR was privatized in 1987, and replaced by the
Japan Railways Group (JR Group). Lists of workers to be employed by the new organizations were drawn up by JNR and given to the JR companies. There was substantial pressure on union members to leave their unions, and within a year, Kokurō's membership fell from 200,000 to 44,000. Workers who had supported the privatization, or those who left Kokurō, were hired at substantially higher rates than Kokurō members. The main trade unions representing railway workers in Japan are now the
Japan Railway Trade Unions Confederation and the
Japan Confederation of Railway Workers' Unions. ==JNR dismissal lawsuit==