Font Farran was instrumental in founding the Catalan left - wing party Esquerra Republicana de Catalunya ( ERC ) .
Font Farran shifted to the Spanish left - wing POUM party on the outbreak of the Spanish Civil War .
Font Farran was instrumental in founding the Catalan left - wing party Esquerra Republicana de Catalunya ( ERC ) , but shifted to the Spanish left - wing POUM party on the outbreak of the Spanish Civil War .