[First applied in 1936 to rebel sympathizers inside Madrid when four columns of rebel troops were attacking that city.]
fifth columnism fifth col'um·nism (kŏl'əm-nĭz'əm) n.
A secret subversive group that works against a country or organization from the inside, as in The government feared that there was a fifth column working to oppose its policies during the crisis. This term was invented by General Emilio Mola during the Spanish Civil War in a radio broadcast on October 16, 1936, in which he said that he had
una quinta columna ("a fifth column") of sympathizers for General Franco among the Republicans holding the city of Madrid, and it would join his four columns of troops when they attacked. The term was popularized by Ernest Hemingway and later extended to any traitorous insiders.

A fifth column is a group of people who clandestinely undermine a larger group such as a nation from within. A fifth column can be a group of secret sympathizers of an enemy that are involved in sabotage within military defense lines, or a country's borders.[1] A key tactic of the fifth column is the secret introduction of supporters into the whole fabric of the entity under attack.[2] This clandestine infiltration is especially effective with positions concerning national policy and defense.[2] From influential positions like these, fifth-column tactics can be effectively utilized, from stoking fears through misinformation campaigns, to traditional techniques like espionage.[2]
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The term originated with a 1936 radio address by Emilio Mola [3] , a Nationalist General during the 1936–39 Spanish Civil War. As his army approached Madrid, a message was broadcast that the four columns of his forces outside the city would be supported by a "fifth column" of his supporters inside the city, intent on undermining the Republican government from within (see Siege of Madrid).[4] The term was then widely used in Spain : Ernest Hemingway elected it as a title for his only play, which he wrote in Madrid while the city was being bombarded; the play was published in 1938 in his book The Fifth Column and the First Forty-Nine Stories.[5]
During the opening stages of the war, as the nationalists were getting nearer to the capital, the Republican government decided to initiate the Paracuellos massacres[6] , and to purge the police, the military and notable middle class civilians in Madrid of conservatives that might align with Nationalist forces[citation needed] . Thus, this supposed "fifth column" did not prove very effective,[citation needed] and Madrid held out until 1939 despite very heavy fighting. Nevertheless, the term caught on.
With the grain requisition crises, famines, troubled economic conditions, and international destabilization in the 1930s, the leaders of the Soviet Union became increasingly worried about the possible disloyalty of diaspora ethnic groups with cross-border ties (especially Finns, Germans and Poles), residing along its western borders; this eventually led to the start of Stalin's repressive policies towards them, most notably to the national operations of the NKVD and forced population transfer.[7]
In Europe, German minority organisations in Poland and Czechoslovakia formed the Selbstschutz and the Sudeten German Free Corps respectively which actively helped the Third Reich in conquering those nations. After 1945, this was cited as justification for the wholesale expulsion of ethnic Germans from Czechoslovakia, Poland and the Soviet Union, as well as return to these countries of territories which had been annexed by Germany.
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