The heartrending massacre of 20 6- and 7-year-old children and six educators in Newtown, Conn., has galvanized public attention once again after a mass shooting. But the killing of children by gun violence is not new. In 2013, as we prepare to celebrate Martin Luther King's birthday and the 50th anniversary of the March on Washington and the dream of our gun-slain prophet of nonviolence, let us truly hear and follow rather than just celebrate him. Now is the time to free ourselves from the plague of gun violence which has taken over 1.3 million American lives since Dr. King and Robert Kennedy's assassinations in 1968. This is twice the loss of life than all American battle casualties in all the major wars we have fought since our nation began.