Concern is mounting that the US government is using antiterror laws - namely, the Patriot Act - to revive a now-discredited practice common during the cold war: the prevention of foreign intellectuals who are critical of administration policies from entering the country and sharing their views with Americans. The practice, called ideological exclusion, became illegal in 1990. But a recent lawsuit - brought by the American Association of University Professors, the American Civil Liberties Union, and the PEN American Center under the Freedom of Information Act - is asking the Bush administration to explain its decisions to revoke or deny...