A claim must generally be made in writing to the federal or state agency. Some agencies, such as the federal Equal Employment Opportunity Commission (EEOC), require you to mail a charge of discrimination or complete one in person at an EEOC office. Other agencies, such as the Occupational Safety and Health Administration (OSHA), will accept complaints over the phone, on their website, or via fax, in addition to those written complaints made through the mail or in person at an OSHA office.