Here are a few resources that may be helpful to you if you feel you have been discriminated against in an interview.

Race, Gender, Religion, Ethnicity, Age, Disability, Country of Origin, Marital Status, Family Status
The U.S. Equal Employment Opportunity Commission
Phone: 1-800-669-4000
Email: info@eeoc.gov

Military Service
U.S. Department of Labor
Online Form: http://www.dol.gov/elaws/vets/userra/ee_disc2.asp

Phone: 1-866-4-USA-DOL

Sexual Preference
Please find the information for your state on this list http://www.eeocoffice.com/