 That same year he was replaced at the head of the CNT National Committee by Juan Peiró, after Segundo Blanco was arrested and tortured in December 1926 by Commander Lisardo Doval, who gained infamy in the repression of the Asturian Commune.It was his first admission to prison, being imprisoned again in 1931 and 1934.After the proclamation of the Second Spanish Republic, he participated in the CNT Congress of 1931, where he presided over some of the sessions, and at the beginning of the Spanish Civil War he chaired the Gijón War Committee that the city had established.