The “Unmasking Antifa Act of 2018,” legislation introduced in the House, carries a potential 15-year prison sentence for those caught engaging in behaviors typically associated with the “antifa” movement of anti-fascist activists. Under the act, anyone “wearing a mask” or in disguise who “injures, oppresses, threatens, or intimidates any person … in the free exercise or enjoyment of any right or privilege” is subject to a fine or up to 15 years in prison. The bill was introduced in the House last month but received renewed attention on Tuesday after alt-right personality Mike Cernovich encouraged his followers to call their...