Due process
The Fifth and Fourteenth Amendments to the United States Constitution limit the power of the federal and state governments to discriminate. The Fifth Amendment has an explicit requirement that the federal government does not deprive individuals of "life, liberty, or property", without due process of the law. It also contains an implicit guarantee that the Fourteenth Amendment explicitly prohibits states from violating an individual's rights of due process and equal protection. In the employment context, these Constitutional provisions would limit the right of the state and federal governments to discriminate in their employment practices by treating employees, former employees, or job applicants unequally because of membership in a group (such as a race or sex). Due process protection requires that government employees have a fair procedural process before they are terminated if the termination is related to a "liberty" (such as the right to free speech) or property interest. As both Due Process and Equal Protection Clauses are passive, the clause that empowers Congress to pass anti-discrimination bills (so they are not unconstitutional under Tenth Amendment) is Section 5 of Fourteenth Amendment.