"The U.S. sugar program provides a price guarantee to producers of sugar beets and sugarcane and to the processors of both crops. The U.S. Department of Agriculture (USDA), as program administrator, is directed to administer the program at no budgetary cost to the federal government by limiting the amount of sugar supplied for food use in the U.S. market. To achieve both objectives, USDA uses four tools--as reauthorized without change by the 2014 farm bill (P.L. 113-79) and found in chapter 17 of the Harmonized Tariff Schedules of the United States--to keep domestic market prices above guaranteed levels."
CRS Report for Congress, R43998
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html