The International Association of Machinists and Aerospace Workers (IAM) has represented the interests of machinists, engineers, and aerospace workers since the late 19th century. Included within this collection from the IAM's central office are letters to the executive board, union decisions, correspondence, video cassettes, photography, and film reels, circa 1930s-1990s.

International Association of Machinists and Aerospace Workers, District Lodge 143 represented airline workers in the Great Lakes region of North America, specifically with Northwest Airlines. The records (1946-2009) consist of bylaws, benefits and retirement information, conventions proceedings, contracts, apprenticeship materials, publications seniority lists, committee materials, financial records, artifacts, photographs, audiovisual materials, and various types of correspondence.