The biggest wave of job actions in the history of America’s fast-food industry began at 6:30 a.m. on Thursday at a McDonald’s at Madison Avenue and 40th Street, with several dozen protesters chanting: “Hey, hey, what do you say? We demand fair pay.”

That demonstration kicked off a day of walkouts and rallies at dozens of Burger King, Taco Bell, Wendy’s, McDonald’s and other fast-food restaurants in New York City, organizers said. They said 14 of the 17 employees scheduled to work the morning shift at the McDonald’s on Madison Avenue did not — part of what they said were 200 fast-food workers who went on strike in the city.

Raymond Lopez, 21, an aspiring actor who has worked at the McDonald’s for two and a half years, showed up at the daybreak protest on his day off. “In this job, having a union would really be a dream come true,” said Mr. Lopez, who said his pay of $8.75 an hour left him feeling undercompensated. “It really is living in poverty.”

Workplace experts said it was by far the largest series of job actions at fast-food restaurants ever — part of an ambitious plan that seeks to unionize workers and increase wages at fast-food restaurants across the city.