Thirty years after a truck bomb detonated outside a federal building in America's heartland, killing 168 people in the deadliest homegrown attack on U.S. soil, deep scars remain. The bombers were two former U.S. Army buddies, Timothy McVeigh and Terry Nichols, who shared a deep-seated hatred of the federal government fueled by the bloody raid on the Branch Davidian religious sect near Waco, Texas, and a standoff in the mountains of Ruby Ridge, Idaho, that killed a 14-year-old boy, his mother and a federal agent. And while the bombing awakened the nation to the dangers of extremist ideologies, many who suffered directly in the attack still fear anti-government rhetoric in modern-day politics could also lead to violence.