The Montana Stockgrowers Association
According to Mons Teigen, former executive vice president of the Montana Stockgrowers Association, in his essay “A Century of Striving to Organized Strength” published in the Centennial Issue of the Montana Stockgrower in 1984:
In the 1880s, cattlemen began forming groups and holding meetings across the territory to address these issues. None really stuck until a group—referred to by many different names, but most commonly known as the Eastern Montana Stockgrowers Association—was formed in 1883. Another group, known as the Montana Stockgrowers Association, reorganized and held its first meeting in July 1884 in Helena. The groups eventually merged in 1885.