The 19th of April Movement

By 1974, another challenge to the state's authority and legitimacy had come from the 19th of April Movement (M-19), leading to a new phase in the conflict. The M-19 was a mostly urban guerrilla group, founded in response to an electoral fraud during the final National Front election of Misael Pastrana Borrero (1970–1974) and the forced removal of former president Gustavo Rojas Pinilla.