Today the Supreme Court will hear oral argument on whether a federal statute that criminalizes any person who encourages a non-citizen to come to, or reside in, the United States, should be struck down. If the court holds that the law can stand, the impact could be devastating and far-reaching — potentially criminalizing legal advice by immigration attorneys and the written and spoken words of immigrant advocates and activists. The chilling effect it would have on non-citizens and their allies would be profound and especially insidious in this political moment of increasing, and increasingly nefarious, anti-immigrant sentiment. This case centers...