Danny Glover, Barry Levinson, Pablo Schreiber, Ed Begley Jr., Bob Balaban and Kathleen Chalfant have boarded Stephen FrearsHBO movie Muhammad Ali’s Greatest Fight, which dramatizes the machinations of the Supreme Court as Ali pursued Conscientious Objector status. They join previously cast Christopher Plummer, Frank Langella and Benjamin Walker. Glover will play Justice Thurgood Marshall, the first African-American Justice to serve on the Supreme Court; Levinson will play Justice Potter Stewart, who was an unpredictable voter on the Court; Begley Jr. will play Justice Harry Blackmun, President Richard Nixon appointee to the Supreme Court; Balaban will play an Advocate for Vietnam Veterans who argues a case before the Court; Schreiber will play Covert Becker, a Supreme Court clerk who doesn’t hide his contempt for liberals; and Kathleen Chalfant will play Ethel Harlan, Justice Harlan’s wife. Written by Shawn Slovo, Muhammad Ali’s Greatest Fight is executive produced by Frank Doelger, Tracey Scoffield, and Jonathan Cameron.