Times of war place considerable stress on civil liberties, especially ones protected by the First Amendment. When the nation must gather itself to fight an enemy who is intent on killing us, it is perhaps only natural that our tolerance for the usual disorder of dissent will decline. When everyone has to sacrifice for the common good, when fellow citizens are dying in that cause, the costs of speech are visible and serious. Dissent may dissuade or discourage soldiers from fighting; sowing doubt may weaken resolve just when it\u27s needed most; falsehoods and misinformation may lead to catastrophic shifts of policy; and the enemy\u27s perceptions of a divided society may well strengthen its determination to fight on, with still more injury a...