Harvard threatened all students inside the university’s pro-Palestinian encampment with “involuntary leave,” two weeks after students first pitched tents on the campus’ iconic Harvard Yard. “I write today with this simple message: The continuation of the encampment presents a significant risk to the educational environment of the University,” the university’s interim president Alan Garber wrote in an email sent to students, faculty and staff. “Those who participate in or perpetuate its continuation will be referred for involuntary leave from their schools. Students put on leave will be unable …