LAS VEGAS — In a court ruling with potentially broad implications for U.S. immigration cases, a federal judge in Nevada found that a criminal law that dates to 1929 and makes it a felony for a person who has been deported to return to the United States is unconstitutional. U.S. District Judge Miranda Du in Reno, in an order issued Wednesday, found the law widely known as Section 1326 is based on “racist, nativist roots” and discriminates against Mexican and Latinx people in violation of the equal protection clause of the Fifth Amendment. Section 1326 of the Immigration and Nationality...