For the last two years, labor unions have a led a campaign known as "Fight for 15" to pressure the fast food and retail industries to raise the minimum hourly wage to $15. Big Labor has a particular interest in legislative efforts to raise the minimum wage, given that many union contracts are indexed to it. In a February 2013 research brief, the Center for Union Facts noted that collective bargaining agreements often "either set baseline wages as a percentage of the state or federal minimum wage, or mandate a flat wage premium above the minimum wage."