In the times earlier than Ms. Williams’s letter, union supporters mentioned the company was continuing to intimidate and monitor staff at three extra Buffalo-area stores that had filed petitions for union elections. Throughout the marketing campaign in Buffalo, which started in late August, union supporters complained that out-of-town officers who converged on their stores, including Ms. Williams, had been monitoring and intimidating them. The company stated that the officials had gone to Buffalo to help clear up issues like understaffing and inadequate training, and that it had taken comparable steps around Business News the country since the spring. “From the start, we’ve been clear in our belief that we don’t need a union between us as partners, and that conviction has not modified,” Rossann Williams, the company’s president of retail for North America, said in a letter to U.S. workers on Monday. Disagreement over the invoice also pushed shares of …