WASHINGTON (Reuters) - The U.S. Supreme Court on Monday revived Ohio’s contentious policy of purging infrequent voters from registration rolls in a ruling powered by the five conservative justices and denounced by liberal Justice Sonia Sotomayor as an endorsement of the disenfranchisement of minority and low-income Americans. In a 5-4 decision in the closely watched voting-rights case, the high court overturned a lower court’s ruling that Ohio’s policy violated a 1993 federal law enacted to make it easier to register to vote.