Fifth column Quislings.
A cardinal technique of the fifth column is the infiltration of sympathizers into the entire fabric of the nation under attack and, particularly, into positions of policy decision and national defence. From such key posts, fifth-column activists exploit the fears of a people by spreading rumours and misinformation.
Sir Winston Churchill referred to these people as "A vile race of Quislings—to use a new word which will carry the scorn of mankind down the centuries—is hired to fawn upon the conqueror, to collaborate in his designs and to enforce his rule upon their fellow countrymen while grovelling low themselves." He used the term again in an address to both houses of Congress in the United States of America on 26 December 1941