[2] On 12 August 1923 he took part in the regional congress of the CNT held in Manresa, rejecting the post of secretary offered to him because he was declared illiterate.

With the dictatorship of Primo de Rivera increased the repression against the labor movement as groups of gunmen, organized by the Sindicatos Libres, began to mortally attack the most exposed union activists.

[4] It was during one of these "operations" that on 24 March 1924, Jover was arrested in Barcelona, but managed to escape and go into exile in Paris together with Francisco Ascaso, Buenaventura Durruti and most of the militiamen of Los Solidarios.

In order to avoid expulsion from France, along with Buenaventura Durruti and Francisco Ascaso he emigrated to Latin America,[6] where he created another illegalist group Los Errantes, which organized the first expropriation robbery in the country's history.

In 1927 Jover took part in the organization of the assassination attempt on Alfonso XIII, but despite the order of summons and search, he managed to escape arrest.

[8] After the outbreak of the Spanish Civil War in July 1936, he quickly joined the Confederal militias and went on to lead the Ascaso Column in its advance from Barcelona to the Aragón front,[9][10] also participating in the politics of the towns nearby, where they were able to organize their libertarian ideas in practice.