Filing A Charge of Discrimination. Retaliation for opposing unlawful discriminatory practices.We are Discrimination and Harassment Lawyers. Michelle A. Travis, Recapturing the Transformative Potential of Employment Discrimination Law, 62 Wash. All employees are required to cooperate with an investigation of discrimination, harassment, or retaliation. Discrimination based on another's membership in a protected class is strictly prohibited. The discrimination occurred when Dave Harris, Travis's supervisor, denied her a promotion in favor of Michael Pooler, a male employee. EEOC's new Dallas director talks race, gender and sexual discrimination in the workplace. How discrimination based on national origin occurs in the workplace.