Have you read this in the Act? I would be surprised if you had because the United States does not have a Human Rights Act. Human Rights in the United States are covered under several different federal and state laws, including the Constiitution and amendments, treaties, and other laws.
I haven't read all the laws, but the ones I have read are quite specific regarding discrimination. Race, Gender, Religion, Sexual Orientation, Disability, and so on...but I haven't read anywhere that discrimination includes chosen profession.