"unlawful discrimination" means treating someone unfairly or differently based on characteristics like their race, gender, religion, or disability, which is against the law. Full definition
Similar and related words and phrases are presented below.
If you think you might have been the victim of unlawful discrimination in the workplace you need to act quickly. (truthlegal.com)
It is the company's policy that anyone within the company concerned with making decisions should avoid unlawful discrimination in any form in their dealings with other employees. (totumpartners.com)
It's not a question of freedom of speech; in the workplace, expressing opinions which create an offensive or hostile environment for women (or any workers) constitutes unlawful discrimination. (lawyer-monthly.com)