"When, in 1936, General Emilio Mola announced that he would capture Madrid because he had four columns outside the city and a fifth column of sympathizers within, the world pounced on the phrase with the eagerness of a man who has been groping for an important word. The world might better have been stunned as by a tocsin of calamity. For what Mola had done was to indicate the dimension of treason in our time... Other ages have their individual traitors... But in the 20th century, for the first time, men banded together by millions in movements like Fascism and Communism, dedicated to the purpose of betraying the institutions they lived under. In the 20th century, treason became a vocation whose modern form was specifically a treason of ideas."
Whittaker Chambers, Witness