industrial union; single-industry union
Refers to a labor union organized by industry rather than by company or craft. Common in Japanese labor terminology.
Japanese labor unions include enterprise-based unions and industrial unions.
He is active as an officer of an industrial union.
労働組合 is the general term for any labor union, whereas 単産 specifically denotes an industry-wide union federation.
Abbreviation of 単一産業別労働組合 (tan'itsu sangyōbetsu rōdō kumiai, 'single-industry labor union').