The Fair Labor Standards Act guarantees, for most employees, payment of at least the federal minimum wage for each hour worked. Effective July 24, 2009 through the present, the federal minimum wage is $7.25 per hour for non-exempt employees.
In addition to the federal minimum wage, many states have their own minimum wage laws, some of which require employers to pay employees more than the federally-mandated $7.25 per hour. The Department of Labor provides a state-by-state listing: http://www.dol.gov/whd/minwage/america.htm
If you believe that your employer may have violated the Fair Labor Standards Act, please contact the FLSA attorneys at The Weiner Law Firm LLC.