Need some help with a law question. Thanks :)?

Linda Brown and Ralph Williams are recent law school graduates hired as first year ociates by Dewey, Cheatem, and Howe, a large Boston law firm. Brown graduated from Suffolk Law School, while Williams graduated from Harvard Law School. Over coffee one day, Brown discovers that Williams is being paid $20,000 more than she is. Is Dewey, Cheatem, and How violating the law by paying Brown less than Williams? Explain.