A Massachusetts school district allegedly held racially segregated events that specifically excluded white students, according to a federal lawsuit filed by a non-profit group representing three families. Non-profit group Parents Defending Education filed a lawsuit in federal court on Tuesday afternoon, arguing that Wellesley Public Schools violated the constitutional rights of their students, and also suppressed students’ First Amendment rights with its policy on biased speech, CBS Boston reported. Court papers state that students were allegedly told by the district that the phrase “Blue Lives Matter,” which refers to law enforcement officers, is associated with white supremacy, according to the news outlet. “Nearly seven decades of Supreme Court precedent have made two things clear: Public schools cannot segregate students by race, and students do not abandon their First Amendment rights at the schoolhouse gate,” the lawsuit says. Wellesley Public Schools “is flouting both of these principles,” the lawsuit states. Nicole …