Tom Ducy served as General Secretary-Treasurer of the International Association of Machinists and Aerospace Workers (IAM), 1987-1993. Collection includes an IAM constitution, 1913; and minutes of IAM Lodge 47, also know as the Pioneer Lodge (Commerce City, Colo.),1889-1891; and a jurisdictional agreement that was part of a collective bargaining agreement with the Curtiss-Wright Corporation Airplane Division, St. Louis Plant, 1942.

The International Association of Machinists Local 34 (Kenosha, Wisconsin) was chartered in 1897. The local's records include correspondence, newspaper clippings, contracts, agreements, photographs and charters, documenting its history, 1905 to 1988.