Effective March 15, 2001, employers who employ H-2A workers must display a new H-2A poster where employees can readily see it. The poster is also available in Spanish. The poster can be accessed through the links in the prior sentences.
Full information regarding federal posting requirements related to the workplace is available via this link – http://www.dol.gov/compliance/topics/posters.htm.
Of course, there are also state law requirements in many states.