U.S. college professors learning freedom of expression has risks, limits.(Chicago Tribune)

LOS ANGELES _ In California, a professor was placed on leave after Arab students accused him of calling them terrorists. In New Mexico, a professor was disciplined after he told his students that anybody who could blow up the Pentagon "gets my vote." In Minnesota, students complained to administrators that professors' criticism of President Bush made them feel insecure.

Similar incidents in the wake of the Sept. 11 attacks have resulted in disciplinary action for outspoken faculty members, raising questions about academic freedom on U.S. campuses in times of national crisis.

While the circumstances in the wake of the attacks on the World Trade Center and the Pentagon may be unlike any in the nation's history, the response by university administrators is not.

"There is a long …