The protest followed Self_motion the failure of an effort of the Oglala Sioux Civil Rights Organization ( OSCRO ) to impeach Change_of_leadership tribal president Richard Wilson , whom they accused Judgment_communication of corruption and abuse Committing_crime of opponents .

More than 60 opponents of the tribal government died Death violently during those years , including Pedro Bissonette , director of the Oglala Sioux Civil Rights Organization ( OSCRO ) .