El Super grocery workers are urging consumers to boycott their employer, a chain of supermarkets located primarily in Latino neighborhoods.
The car firm claimed that "entering mediation over issues raised might violate U.S. national labor law."
Supporters of the Raise the Wage Campaign, including church organizations, students groups, seniors, immigrant right groups, unions and labor leaders rallied at City Hall in LA.
One fourth of Oregon's workforce - 412,000 workers - are in "low-wage" occupations with a median annual income of under $12 an hour.
Union density was 11.1 percent in 2014, the Bureau of Labor Statistics reported, but the workforce grew even more.
No union can survive without being able to win contracts and thus being able to make substantial changes in wages and conditions.
Overtime pay has increasingly moved to the top of labor's agenda because millions of workers are working overtime and not getting paid for it.
A panel of workers, a Laborer-turned-big-city mayor, a small business owner and others proposed practical moves for taking labor's "Raise The Wages," campaign nationwide.
The nation's largest labor federation, the AFL-CIO, rolled out here today its first- ever Raising Wages agenda.
Many of the people gathering in Washington this morning at the first-ever AFL-CIO National Summit on Raising Wages didn't have an easy time getting here.