Maoist leader Sabyasachi Panda has filed a petition in the court of Additional District Judge-II, Brahmapur challenging treason case framed by the police and allowed by the State Government against him.Panda’s lawyer Deepak Patnaik had filed the petition in the court on Monday. In the petition, the lawyer said the police had framed the treason case on the basis of a case (GR case no-809/2011) lodged in 2011.