Erratum.
The article "Polish universities face crackdown" by Mark Crawford (News and Comment, 12 July, p. 146) did not properly identify an underground journal and two universities that have resisted the clampdown on academic freedoms. The journal is Tygodnik Mazowsze. The proper names of the universities are Jagiellonian University in Krakow and Wroclaw B. Beirut University in Wroclaw.