Both federal and state law protect employees and applicants from employer retaliation for engaging in activity that is protected by anti-discrimination laws.
You cannot retaliate against employees for participating in activities to further the enforcement of employment discrimination laws.1 The retaliation prohibition is quite broad and includes retaliation against a person who objected to a practice that is legal but that the person reasonably believed to be illegal. Protection from retaliation is not limited to applicants and employees; it covers all individuals, including former employees.2
1.Govt. Code sec. 12940(h)
2.Sherman v. Burke Contracting Co., 891 F.2d 1527 (11th Cir. 1990)