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A '''fifth column''' is a group of people or sympathizers who rationally and clandestinely try to undermine a larger group to which it is expected to be loyal. Members may engage in espionage or sabotage within defense lines or within national borders.   

A '''fifth column''' is a group of people or sympathizers who rationally and clandestinely try to undermine a larger group to which it is expected to be loyal. Members may engage in espionage or sabotage within defense lines or within national borders.  Per the ''Encyclopedia Britannica'', "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 defense."<ref> Volubrjotr | politicalvelcraft.org, Rothschild Zionists Are A Fifth Column Within The United States Of America, https://politicalvelcraft.org/2013/11/22/rothschild-zionists-are-a-fifth-column-within-the-united-states-of-america/, Nov. 22, 2013</ref>

==Historic examples==

==Historic examples==