Social Security Administration – The official website of the SSA. Lots of information and forms available for download.
US Department of Labor – A wealth of information on scores of topics: Child labor, minimum wage, overtime, unions, family and medical leave, etc.
US Citizenship and Immigration Services (Formerly the INS) – The best source to research immigration rules and regulations and to obtain compliance forms.
American Payroll Association – The American Payroll Association is the professional society for Payroll Professionals. The Association works to increase the payroll professional’s skill level througheducation and mutual support.