The correct answer is the National Grange.
The National Grange was the first sizable political organization formed by U.S. Farmers.
A coalition of farmers in the Middle West formed the Granger movement to fight against monopolistic transportation practices after the Civil War. Oliver Hudson Kelly was the founder of a group called The Patrons of Husbandry in 1867. The purpose of this group from Minnesota was to educate farmers of America in farming and social issues. In 1870 the movement grew considerably and create consciousness about the elevated prices the railroad’s companies charged for transportation of harvest.