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Trade union - Wikipedia
Trade union | Definition, History, & Facts | Britannica
Labor Union: Definition, History, and Examples - Investopedia
Labor unions in the United States - Wikipedia
Trade unions in transition: What will be their role in the future of ...
The future of labor unions, according to Harvard economist
What trade unions do and what joining one means - The …
Trade unions and globalization: trends, challenges and responses
The role of Trade Unions - International Labour Organization
Harvard Trade Union Program – Center for Labor and a Just …