This book is a thick, descriptive and interpretative at the same time, synthesis where it is drawn with precision and clearness the unifying process of the left that supports Catalan autonomy. First, it is studied how the Centre Nacionalista Republicà was born, as a product of a split of the Lliga Regionalista in 1904. The dissidents provided themselves with a newspaper, El Poble Català, germ of the CNR and first sample of the national and republican belief in Catalan autonomy, which had politicians of the stature of Jaume Carner and Ildefons Suñol. The CNR, gulped down by the policy of anti-belief in Catalan autonomy repression leaded by the military class, could not avoid that Cambó and the Lliga appropriated the success of the repression of the belief in Catalan autonomy. Next, it is done a thorough analysis of the Unió Federal Nacionalista Republicana, born in 1910 by the warmth of the open crisis in the belief in Catalan autonomy due to the events of the Tragic Week, which finally failed in an anti-nature agreement with the Radical Party, unable to assume the role of the Lliga Regionalista. A series of questions and obvious realities hang over throughout the entire book. A key one shows up: the difficulties of intellectuals, writers and journalists to become political leaders, and linked with it, the difficult need to turn the ideas, ideology if wanted, into a programme of practical and pragmatic government, able to combine idealism with realities and to make comprehensible and desirable a policy of real change for the masses.