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.”
The expression dates from the Spanish Civil War in 1936 when the Francoist General Mola, whose forces were threatening Madrid, boasted that he had four columns approaching the city and a fifth column within it. In the United States, the Democratic Party has been considered America’s Communist Fifth Column, that is promoting Socialism and social radicalism. It emerged from deep within the U.S. government itself and has reached the point where, as reported in June 2017, even the mention of God and country are topics which trigger microaggressions. Read more at Conservapedia…