What is "zenzosen"

Zenzōsen, also known as Zen Nihon Zōsen Kikai Rōdō Kumiai or the All-Japan Shipbuilding and Engineering Union, is a trade union in Japan, representing workers in the ship-building and ship repair industry. Zenzōsen was established in September 1946, shortly after the end of WWII. Zenzōsen is a federation of individual, enterprise-level unions - the normal model of trades unionism in Japan. It was initially the dominant union in the Japanese shipbuilding industry, but was eventually eclipsed by the Jūki Rōren (Japanese Federation of Shipbuilding and Engineering Workers' Unions). Zenzōsen was the more militant of the two unions, and was more strongly represented at the smaller shipyards. Zenzōsen was affiliated to the Japanese Socialist Party.