By Dave Gram The Associated Press via Bloomberg Businessweek MONTPELIER, VT. - Two stalwarts in the fair-trade coffee movement are at odds over a move by a national certifying organization to expand beyond small, farmer-owned cooperatives and allow larger growers to sell their product with a fair trade label. Equal Exchange in West Bridgewater, Mass., took out a full-page ad Sunday in The Burlington (Vermont) Free Press calling on Waterbury-based Green Mountain Coffee Roasters to sever relations with Fair Trade USA. Equal Exchange criticized Fair Trade USA for leaving an international umbrella group devoted to fair trade and for inviting larger coffee plantations into the fair trade fold. "With this move, they threaten to reverse decades of hard-won gains while potentially putting at risk the very survival of the farmer cooperatives," it said. FTUSA remains the dominant player in the U.S. in affixing a label to products as a signal to socially consc...