In 1927 Valiente set up Juventud Católica de España, the ostensibly apolitical grouping concerned with defence and dissemination of Catholic values among the youth; in 1931 it was federated with Acción Católica, a broad organization of lay Catholics led by Ángel Herrera Oria.
In 1933 Valiente proceeded to build the Acción Popular youth organisation, Juventudes de Acción Popular, and became its president.