Legacy of the Black Panther Organization

What WERE the competing legacies of the BPP? How does history remember Dr. Martin Luther King Jr. and proponents of nonviolence, and organizations like the Southern Christian Leadership Conference (SCLC) and National Association for the Advancement of Colored People (NAACP), as compared to the Black Panther Party and other groups associated with the "Black Power 'phase' of the [Civil Rights] movement"? (look on the first page of "Some Abstract Thing Called Freedom") What were the early problems that plagued the Black Panther Party in Oakland? What sort of events cemented their reputation for violence in the media? What activities of the Black Panther Party challenged their villainous reputation in the media?