Twenty years ago, when I was a senior at Yale, the graduate students embarked on a two-week “grade strike,” during which they refused to hand in the fall grades of the undergraduates they were teaching. Grades were due on January 2, 1996, but the grad students, then as now agitating for union recognition, withheld the grades until two weeks later, when it became clear that they were losing the battle on all fronts. The dean of the graduate school brought three union leaders up on disciplinary charges (one was dismissed, though the other two had their punishments overturned); some faculty members threatened graduate students with reprisals, like poor letters of recommendation; and the Yale undergraduates, for whom a transcript without grades was like a scull without oarsmen, turned viciously on their teaching assistants.