A pro-Israel rally in a Boston suburb turned violent Thursday evening when a passerby was shot during a scuffle after confronting a group of demonstrators, authorities said. Police were called at 6:40 p.m. to the scene of what they described as a small rally in Newton. Words were exchanged before a passerby rapidly crossed the street and tackled one of the demonstrators, Middlesex County District Attorney Marian Ryan said. “A scuffle ensued. During that scuffle, the individual who had come across the street was shot by a member of the demonstrating group,” Ryan said during a news conference la…