An immigration judge ruled Wednesday that the U.S. can deport Imam Ahmad Sarsour, leader of Wisconsin's largest mosque and a vocal Palestinian rights advocate, on national security grounds. No surprise here. Outspoken critics of Israeli policy get branded as security threats in ways that would never apply to people criticizing other countries. This is how you silence dissent without technically banning speech: slap a security label on it and let the deportation machinery do the work.