A prominent Supreme Court litigator was sentenced on Friday to six years in prison for evading a multimillion-dollar IRS tax debt and engaging in mortgage fraud, a case that cast a spotlight on his secretive lifestyle as a high-stakes poker player and featured trial testimony from a Hollywood movie star. Thomas Goldstein, who also published a popular blog about the nation’s highest court, had asked U.S. District Judge Lydia Kay Griggsby to spare him from a prison sentence. Instead, the judge sentenced Goldstein to five years of supervised release after his prison term and ordered him to pay over $3.1...