Correspondence deals with and includes: many newspaper articles and letters on Iron Range (Minnesota) organizational campaign; a brief history of the happenings in that area; notes McCartney had written on the subject; a comprehensive report of organization activities among metal miners in Northern Minnesota; minutes from Minnesota State Building Trades Council. Correspondents include: William Green; John F. McCall, Secretary Bldg. Trades; Richard J. Thomas; William Wright, Organizer; Alexander Marks, Organizer; Peter A. Stark, Secretary Hebbing Central Labor Union; Holger Nykanen; R.A. Olson; Harry E. O'Reilly; E.L. Slaughter; Frank J. Thill, President.