On Tuesday afternoon, more than 100 students walked out of Harvard professor John L. Comaroff’s class, protesting his return to campus after being accused of sexually harassing and assaulting his female students. Last year, three female graduate students filed a lawsuit in Boston federal court against the university, alleging that the institution ignored reports about Dr. Comaroff’s inappropriate behavior. The plaintiffs claim that the professor forcibly kissed and groped students without their consent and threatened to sabotage students’ academic career if they reported him to the university board. John Comaroff is not named as a defendant in the lawsuit against Harvard.