You can file an Americans with Disabilities Act complaint alleging disability discrimination, including any complaint alleging violations against people with HIV/AIDS, against a State or local government or a public accommodation online or by mail or fax.
To file a complaint electronically, go to the ADA Online Complaint Form
To file complaints related to discrimination in employment or housing, visit:
U.S. Equal Employment Opportunity Commission - http://www.eeoc.gov/employees/charge.cfm
U.S. Department of Housing and Urban Development - http://www.hud.gov/complaints/