The official USDA roles/purposes are outlined on their web site. The true roles/purposes set by the misathropic leadership relates to fully supporting agribusiness in the United States. There is no question that the majority of people working for the USDA are genuine and honest hard working people. However, the department's mission has been steered away from public good and toward the support of extremely large corporate entities. The small farmer sees little benefit.
For instance, the USDA is the department in charge of the nutrition guidelines for the school lunch program. Essentially, it buys meat and dairy products when wholesale prices dip. It supports prices. The truth is that milk, dairy, and meat are consumed in excess and cause well-studied diseases in America. The USDA supports for these unhealthy foods causes excess consumption and diseases such as: Heart Disease, Diabetes, Cancers, Strokes, and even Osteoporosis.
It supports production of high fructose corn syrup which is a leading cause of obesity in America.