In the Supreme Court of the United States, Richard Mathis, petitioner, v. United States, respondent : on writ of certiorari to the United States Court of Appeals for the Eighth Circuit : brief of the American Immigration Lawyers Association, Immigrant Defense Project, National Immigration Project of the National Lawyers Guild, and individuals with pending immigration appeals raising the question presented, as amici curiae in support of petitioner /

At issue is the correct approach for determining whether state convictions qualify as predicate offenses in federal court for enhanced sentencing under the Armed Career Criminal Act, and by analogy, for determining which offenses constitute aggravated felonies for purposes of immigration law