As stated above, its unknown whether GMO food is safe or not, because there is little research, but don't you think we should have the right to decide at the grocery store to know if we are buying GMO food or not? As of now, there is no law that mandates labeling of GMO food. Mansanto has such a wide grip on the food market, that its food is in an extremely large amount of every day products. Making GMO labels mandatory would at least give consumers the knowledge of what they are buying, else, we have no idea if its regular corn or GMO corn and right now the products don't have to label this.
If the USDA wants to let them sell untested GMO food, then fine, but at least allow us consumers to know what we are buying.