A group of current and former Prince George's County school employees has filed a lawsuit against the school system, alleging that a principal engaged in systematic discrimination against white teachers and the African American teachers and staffers who came to their defense. The lawsuit, filed in U.S. District Court in Greenbelt on Monday, alleges that Angelique Simpson Marcus, the principal of Largo High School, has targeted white teachers because of their race, and the African American teachers and employees who stood up for them, since she became principal in 2007. The lawsuit alleges a pattern of name-calling, derogatory language and...