In 1936, a Spanish Nationalist General was poised outside of Madrid waiting with four columns of troops to take back the city from Communist (Republican) forces. When General Emilio Mola Vidal was asked which of the four columns would seize the city, he replied, "The Fifth." When asked to explain what he meant, he told his subordinates that the Fifth Column was a group of his loyalists inside of Madrid who would help him subvert and overthrow the Communists who held control. In viewing America's worldwide war on terrorism and our efforts to protect our homeland from another 9-11 attack,...