During the peek of the First Cold War and its transfer to the region due to the rupture of Washington with Havana, the control mechanisms of the intelligence agencies were sharpened. They pursued mainly possible communist outbreaks in the country. In this context, this article aims to analyze the representations of the Dirección de Inteligencia de la Policía de la Provincia de Buenos Aires (DIPBA) and of the Secretaría de Inteligencia de Estado (SIDE) on the Tacuara right-winged nationalist youth groups, these groups, that emerged after the fall of the Peronism in 1955, had caught the public eye because of their violent political pranti-communist, anti-liberal and anti-Semitic practices, considering that this demonstrates the degree of penetration of the objectives of the Cold War in the practices of control and security and in the reports of these agencies.