Which of the following has been the largest organized group of U.S. unions during the past 50 years?

Question

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The AFL-CIO has been the largest organized group of U.S. unions for the past 50 years. It was formed in 1955 as a merger between the American Federation of Labor (AFL) and the Congress of Industrial Organizations (CIO). The AFL-CIO represents over 12 million workers in the United States. Change to Win is a coalition of unions that split from the AFL-CIO in 2005, and the AFL and CIO were separate entities prior to their merger.

Which of the Following Has Been the Largest Organized Group