Yale’s president, Peter Salovey, took to these pages last October to affirm that “we adhere to exceptionally strong principles of free expression.” He invoked Yale’s exemplary 1974 Woodward Report, which states that the university’s educational mission is inextricably bound up with “the right to think the unthinkable, discuss the unmentionable, and challenge the unchallengeable.”

A February lawsuit tells a different story. Tucked inside the amended complaint, Doe v. Yale, is the extraordinary claim that Yale punished the anonymous...