The criminalization of political speech and activism against Israel has become one of the gravest threats to free speech in the West. In France, activists have been arrested and prosecuted for wearing T-shirts advocating a boycott of Israel. The U.K. has enacted a series of measures designed to outlaw such activism. In the U.S., governors compete with one another over who can implement the most extreme regulations to bar businesses from participating in any boycotts aimed even at Israeli settlements, which the world regards as illegal. On U.S. campuses, punishment of pro-Palestinian students...