In the twenty-first century, free speech and its twin, free inquiry have increasingly come under fire, and to a far greater degree than in the 1950s, censors come from within academia. Various forms of critical theory have gained substantial influence in U.S. higher education, where adherents use their power to brand free speech and free inquiry as reinforcing the power of the privileged and endangering women and people of color. In this article, the authors use data from the Foundation for Individual Rights in Education (FIRE, since renamed the Foundation for Individual Rights and Expression to reflect increasing problems off campus) on institution speech codes, and surveys of undergraduates regarding support for free speech and perceptions of free speech climates on 154 campuses. The authors divide the sample into the twenty most and twenty least receptive campuses for free speech (high and low FIRE), in effect using a most similar systems design often employed in comparative politics, selecting cases based on the key dependent variable, free speech in this case, in an inductive analysis.