Two public schools in Concord, Mass., are guilty of an “alarming pattern of antisemitic bullying, slurs, threats and retaliation,” leading at least one Jewish student to leave the Concord-Carlisle Regional School District “to escape the hostile climate,” according to a brief that the Anti-Defamation League and others filed with the U.S. Department of Education’s civil rights office on Monday.

The allegedly offending schools are Concord-Carlisle High School, which U.S. News & World Report ranks No. 20 among schools in the state and No. 539 nationally, and Concord Middle School, which the publication ranks No. 91 among middle schools statewide.

The school district “knowingly allowed its schools to become a hostile environment for Jewish students, and it has failed to promptly and effectively address this ongoing problem,” according to the 24-page filing from the ADL, Louis D. Brandeis Center for Human Rights Under Law and the law firm Mayer Brown.