More information about Belanger, and his roles in various labor organizations, can be found in the following related collections:

• MS 134, Series 1 This consists of correspondence between Belanger and the Textile Worker's Union of America, New Bedford Joint Board, 1959-1964
• MS 369, Series 1, Subseries C The correspondence, reports, and minutes in this subseries comprise the merger material between the Massachusetts State CIO and the Massachusetts State Federation of Labor, 1955-1958
• MS 369, Series 1, Subseries D These are convention files of the Massachusetts State CIO and the Massachusetts State Labor Council, AFL-CIO. The years 1957-1964 include correspondence and speeches of Belanger.