The Secretary General of the Confederación Nacional del Trabajo is the head of the Confederación Nacional del Trabajo (National Confederation of Labor; CNT), a Spanish confederation of anarcho-syndicalist labor unions. The position is elected by a congress or plenary session of the confederation. The position's powers are limited to technical and administrative affairs. The CNT operated clandestinely during years of repression and splintered. Sources support several timelines of CNT Secretaries General during this time.