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In page History of Colombia:

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The National Front system itself eventually began to be seen as a form of political repression by dissidents and even many mainstream voters, and many protesters were victimized during this period. Especially after what was later confirmed[citation needed] as the fraudulent election of Conservative candidate Misael Pastrana in 1970, which resulted in the defeat of the relatively populist candidate and former president (dictator) Gustavo Rojas Pinilla. The M-19 guerrilla movement, "Movimiento 19 de Abril" (19 April Movement), would eventually be founded in part as a response to this particular event. The FARC was formed in 1964 by Manuel Marulanda Vélez and other Marxist–Leninist supporters after a military attack on the community of Marquetalia.