The Grocery Manufacturers Association (GMA) and major food makers such as Coca-Cola Co and PepsiCo Inc and top biotech seed makers Monsanto Co and DuPont were among heavy spenders on GMO labeling-related lobbying, among other food issues, according to a report issued by the Environmental Working Group. The group analyzed lobbying disclosure forms that cited labeling of foods containing genetically modified organisms (GMOs) along with other policy issues. All told, the opponents of GMO labeling disclosed $15.2 million in lobbying expenditures for the second quarter of 2014, bringing the six-month total for 2014 to $27.5 million. That compared with $9.3 million reported in 2013, according to EWG, a Washington-based nonprofit that supports GMO labeling. In contrast, supporters of GMO labeling disclosed $1.9 million in lobbying expenditures for the first half of 2014, up slightly from $1.6 million spent in 2013.