In the United States, the Civil Rights Act of 1964 prohibits employment discrimination based on race, sex, color, national origin or religion. Initially intended to only combat sexual harassment of women, {42 U.S.C. § 2000e-2} the prohibition of sex discrimination covers men and women. This discrimination occurs when the sex of the worker is made as a condition of employment (i.e. all female waitpersons or male carpenters) or where this is a job requirement that does not mention sex but ends up preventing many more persons of one sex than the other from the job (such as height and weight limits). This act only applies to employers with 15 or more employees.