Triple

Target entity: American Federation of Labor
Context triple: [Teamsters, affiliationHistory, American Federation of Labor]

• A. American Federation of Labor chosen
  The American Federation of Labor was a major U.S. national federation of labor unions, founded in 1886, that focused on organizing skilled workers and advocating for practical economic gains through collective bargaining.
• B. Knights of Labor
  The Knights of Labor was one of the first major national labor organizations in the United States, active in the late 19th century and known for organizing workers across trades to advocate for broad social and economic reforms.
• C. Congress of Industrial Organizations
  The Congress of Industrial Organizations was a major federation of industrial labor unions in the United States that played a central role in organizing mass-production workers and shaping mid-20th-century labor policy.
• D. AFL–CIO
  The AFL–CIO is the largest federation of labor unions in the United States, formed by the merger of major labor organizations and representing millions of workers across diverse industries.
• E. International Association of Machinists
  The International Association of Machinists is a major North American labor union representing machinists and other industrial workers in sectors such as aerospace, transportation, and manufacturing.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.