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The All Japan Dockworkers' Union (JDU; Japanese: 全日本港湾労働組合, Zenkowan) is a trade union representing port workers in Japan.
The union was established in 1946, and was affiliated with Sanbetsu.[1] However, in 1950 it switched to the new General Council of Trade Unions of Japan (Sohyo).[2] Its membership reached 28,214 by 1970,[3] then fell to 22,124 in 1985. In 1989, Sohyo merged with the Japanese Trade Union Confederation, but Zenkowan instead opted to become independent.[1]
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