This year marks the 50th anniversary of a landmark Supreme Court decision: Gideon v. Wainwright in which the justices ruled, unanimously, that defendants in criminal cases deserved legal representation in state courts. If defendants could not afford counsel, the state would have to provide it. Those lawyers are known as public defenders. A new HBO documentary, Gideon's Army, follows three black public defenders working in the Deep South. It airs on Monday.