Numerous state and federal laws require employers to post notices in the workplace in a location where they are accessible to employees. Failure to post such notices is a violation of the law.
Federal posters
The following postings are required by federal law.
Your Rights Under the Fair Labor Standards Act (Federal Minimum Wage)
Family and Medical Leave Act
Employee Polygraph Protection Act
Job Safety and Health Protection
Equal Employment Opportunity is the Law
Uniformed Services Employment and Reemployment Rights Act