From the Document: "The Fair Labor Standards Act (FLSA), enacted in 1938, is the federal legislation that establishes the minimum hourly wage that must be paid to all covered workers. The minimum wage provisions of the FLSA have been amended numerous times since 1938, typically for the purpose of expanding coverage or raising the wage rate. Since its establishment, the minimum wage rate has been raised 22 separate times. The most recent change was enacted in 2007 (P.L. 110-28), which increased the minimum wage to its current level of $7.25 per hour. In addition to setting the federal minimum wage rate, the FLSA provides for several exemptions and subminimum wage categories for certain classes of workers and types of work. Even with these exemptions, the FLSA minimum wage provisions still cover the vast majority of the workforce. Despite this broad coverage, however, the minimum wage directly affects a relatively small portion of the workforce. Currently, there are approximately 2.2 million workers, or 2.7% of all hourly paid workers, whose wages are at or below the federal minimum wage of $7.25 per hour. Most minimum wage workers are female, are age 20 or older, work part time, and are in food service occupations."
CRS Report for Congress, R43089
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html