 This along with campaigns run by various non-governmental organizations (NGO) have been very successful in blocking or limiting the use of GM crops.NGOs like the Organic Consumers Association, the Union of Concerned Scientists, Greenpeace and other groups have said that risks have not been adequately identified and managed and that there are unanswered questions regarding the potential long-term impact on human health from food derived from GMOs.They propose mandatory labeling or a moratorium on such products.