Six Miami Capital Grille workers have joined a national class action lawsuit against the restaurant and its Florida-based parent company Darden Restaurants.

The lawsuit, which was originally filed in January in the U.S. District Court for the Northern District of Illinois – Eastern Division, was amended to add the workers from Miami and Los Angeles. It already includes workers from Chicago, Washington D.C. and New York.

The employees charge that the company violated the federal Fair Labor Standards Act and Civil Rights Act, as well as state wage and hour laws. Violations included failing to pay tipped employees minimum wage, failure to pay employees for all hours worked, failure to pay for overtime hours worked and discrimination against minority employees with regard to promotions.

The six Miami workers were current and former Capital Grille employees, who worked as dishwashers or service assistants. The Miami workers are members of Restaurant Opportunities Centers (ROC) United, a national non-profit worker center for restaurant workers.

“Our goal is to ensure that restaurant workers are treated fairly, as opposed to being taken advantage of in the workplace,” said Jean Souffrant, coordinator of the Restaurant Opportunities Center of Miami. “It’s about time workers banded together and demanded there are changes in the workplace.”

Darden spokesman Rich Jeffers issued a statement saying the company believes the “allegations are baseless,” but that it “will investigate them thoroughly.”

“For more than 40 years, Darden has made a firm commitment to diversity and inclusion at all levels of the company,” Jeffers said. “We maintain a zero tolerance policy for any acts of discrimination. One of our guiding principles is to attract, retain, engage and develop a workforce that reflects our diverse customer base.”