By Julie Jargon 

McDonald's Corp. said Thursday that it would probe allegations that the fast-food giant underpaid some U.S. staff and deducted expenses that left them below state or federal minimum-wage levels.

A long-running campaign over McDonald's labor practices escalated this week as a group of employees filed seven lawsuits against the company and some of its franchisees, seeking unspecified back pay and damages.

The 27 named plaintiffs in suits filed in three states claim to represent tens of thousands of McDonald's workers, and are seeking class-action status for their actions. The allegations include workers being forced to clock out during times when restaurants were quiet and barred from taking breaks, while some overtime was left unpaid and staff bore the cost of buying and cleaning uniforms.

"We are currently reviewing the allegations in the lawsuits," said a McDonald's spokeswoman. "McDonald's and our independent franchisees are committed to undertaking a comprehensive investigation of the allegations and will take any necessary actions as they apply to our respective organizations."

McDonald's has more than 14,000 restaurants in the U.S., 90% of which are owned by franchisees, employing around 750,000 staff.

The suits name McDonald's in addition to the franchisees because, the plaintiffs allege, the company sets the policies to be followed at its restaurants.

A year-long campaign by fast-food workers backed by the Service Employees International Union has seen protests against restaurant owners and calls on chains to raise wages to $15 an hour and allow staff to join a union.

McDonald's has come under particular fire from critics such as Fast Food Forward and Low Pay Is Not OK after posting messages on an internal employee resource hotline and website that included suggestions that workers seek government assistance or take a second job to make ends meet.

The lawsuits filed this week in either state or federal court in California, Michigan and New York all seek class certification or collective-action certification.

The pressure on McDonald's comes amid a debate in Washington over whether to raise the federal minimum wage to $10.10 an hour from $7.25. Numerous states and cities have recently raised the minimum wage, putting increasing cost pressure on restaurants, which are also facing rising labor costs associated with the Affordable Care Act.

Attorneys representing the workers say some of the plaintiffs were referred to them indirectly by the Service Employees International Union. The attorneys declined to say who is paying their retainers.

The McDonald's lawsuits come as the hamburger chain is trying to improve customer service as a way to boost lagging sales. McDonald's on Monday reported its fourth consecutive month of same-store sales declines in the U.S.

The burger giant has admitted in recent months to losing relevance with consumers and to having complicated its own kitchens with too many new products that in turn slowed service. McDonald's Chief Financial Officer Pete Bensen told investors on Tuesday that the company is focusing on getting back to the basics of providing fast, friendly service by ensuring restaurants staff properly to serve more customers faster, especially during peak periods.

An attorney representing plaintiffs in Michigan said McDonald's employs software at its restaurants that provide data on the stores' labor cost as a percentage of sales. The attorney said that when labor costs reach a certain percentage of sales, some restaurant managers take workers off the clock to keep labor costs down. Attorneys also said McDonald's software system provides notice to franchisees when workers are nearing eligibility for overtime.

So-called wage theft is a common practice in service industries, according to Catherine Ruckelshaus, general counsel at the National Employment Law Project, a nonprofit research and advocacy organization. A 2010 study by the group estimated that the practices reduce the annual income of the average low-wage worker by 15%, or $2,600.

Write to Julie Jargon at julie.jargon@wsj.com

Corrections & Amplifications McDonald's and some franchisees face 27 named plaintiffs in suits alleging wage theft. An earlier version of this article incorrectly said there are 13 plaintiffs.

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