Unions have had great difficulty in penetrating what sector of the American labor force?

Question

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Unions have traditionally had difficulty in penetrating the white-collar workforce, which consists of professionals and office workers. Blue-collar workers, who engage in manual labor, have historically been more open to unionization, while pink-collar workers, who work in typically female-dominated service industries, have seen an increase in union membership in recent years. Red-collar workers, who work in technical jobs, are not a recognized category of workers for union organization.

Unions Have Had Great Difficulty in Penetrating What Sector of the American