noun
labor federation; labour federation
Refers to a formal organization that unites multiple labor unions or trade unions, often at a national or regional level.
その労働同盟は全国の組合をまとめている。
That labor federation brings together unions from across the country.
労働組合 is a single labor union, while 労働同盟 is a federation of multiple unions.
Compound of 労働 (labor) and 同盟 (alliance, federation).