Marwan Barghouti did not kill any Israeli civilians. He was the leader of the armed wing of Fatah, and planned resistance actions against occupation forces, which is entirely legitimate. He was convicted in a kangaroo court, for the sole reason of being a determined and charismatic leader who could have led his people to unity and freedom. He is the Israeli Mandela, and Israel is scared to death of him.
About 2,000 demonstrators protest 'occupation policy and fascist settlers' in Nazareth (Haaretz)