Series IV: Correspondence, 1948-1975, 35 linear feet. Includes correspondence of officers Jackie Bright, National Administrative Secretary; Jack Irving, Executive Secretary; Russell Swann, secretary Treasurer; Penny Singleton, Executive President, on all aspects of union administration: jurisdictional disputes, organizing drives, negotiations and contract administration, branches. Also included are four linear feet of correspondence from the Chicago branch, including branch minutes, between 1962 and 1974.