 In 1937, he was responsible for placing Picasso's "Guernica" on display at the International Exposition, and took part in the organisation of the Second Congress of Anti-Fascists Writers.After that, Aub returned to Spain and on August 1937 he was nominated general secretary of the "Consejo Central de Teatro".In 1938 he worked in André Malraux's film "L'espoir" and wrote its screenplay.