(Portland, OR) -- New Seasons Market is being accused of retaliation and union-busting. A group of workers involved in a unionization effort said in a group letter yesterday that they've been retaliated against as a result of the effort. "The Oregonian" reports that New Seasons denies the workers' claims. The letter was sent to B Lab, the Pennsylvania nonprofit that gave the grocery its certification of "rigorous standards of social and environmental performance."