Columbia University and one of its longtime law professors, Katherine Franke, have severed ties after an investigation stemming from her advocacy on behalf of pro-Palestinian students. It was the latest fallout from student and faculty activism related to the Gaza War on a major university campus. Ms. Franke, a tenured professor known primarily for her work as founder and director of Columbia’s Center for Gender & Sexuality Law, had been an advocate for pro-Palestinian students as protests erupted on the campus last school year. She was also one of several faculty members investigated by the university over allegations of antisemitism,...