On 18 July 1936 Pabón was in Madrid, integrating into the Harriers Column. He was later elected as General Secretary of the Regional Defense Council of Aragon and was a member of the Legal Commission of the Ministry of Justice under Joan García Oliver. As a defense lawyer of the Workers' Party of Marxist Unification (, POUM), he had to go into exile in August 1938, and commented on what happened in May 1937:
