The Justice Department today filed a Statement of Interest in a federal lawsuit in Mississippi, explaining that public colleges cannot trample on their students’ First Amendment rights to free speech. The lawsuit is brought by a student organization and J. Michael Brown, a former student at Jones County Junior College, a public institution of higher education in Mississippi. The college’s policies require campus administrators to preapprove all “meetings or gatherings,” and Mr. Brown alleges that college officials called the campus police on him when he sought to engage on campus with fellow students about topics such as free speech and civil liberties.