McDonald’s Corp. is gearing up for more action on the part of a fast food workers group that’s been criticizing the company for paying low wages...A McDonald’s spokeswoman...said, “Our focus remains on our valued employees and the career opportunities McDonald’s offers them...” McDonald’s has been a primary target of community and workers’ groups backed by the Service Employees International Union since Nov. 2012. The campaign to push for fast food workers’ rights to organize and to earn a starting wage of $15 an hour...On May 7, international McDonald’s employees are expected to hand deliver a letter to the company... “We call on you to respect the internationally recognized right to freedom of association as a human right and enter in good faith negotiations with workers’ representatives...,” states the letter...from the International Union of Food, Agricultural, Hotel, Restaurant, Catering, Tobacco and Allied Workers’ Associations,