The correct answer to this open question is the following.
Both the Granger and the Farmers' Alliance found it difficult to stand together on national issues.
The Granger were the Patrons of Husbandry. It was formed in 1867 to support better methods of agriculture to improve the lives and working conditions of farmers. They supported the Greenback Party and the Populist Party.
The Farmers' Alliance was a movement of agrarian people in the 1870s and 1880s. The movement also aimed to help farmers forming cooperatives. The National Farmers' Alliance grew out of the Granger movement. The problem between the two movements was that the Granger and the Farmers' Alliance found it difficult to stand together on national issues.