Currently known as the International Association of Machinists (IAM), the organization was formed by 19 machinists who meet in a locomotive pit in Atlanta, Ga. in 1888. The men called themselves "The Order of United Machinist and Mechanical Engineers." Even though the organization remained secret due to employer hostility, within a year 40 locals had been formed. Membership grew via contact between workers who traveled from place to place looking for employment on the railroads. In 1889, the union's name was changed to the "National Association of Machinists."
From the description of Union charter, 1891 [manuscript]. (Denver Public Library). WorldCat record id: 334972218