Intensely patriotic, he was one of the most prominent critics and leaders of the opposition to occupation, alongside Américo Lugo; though, as a result of his political writings, Fiallo was sentenced to 3 years of hard labor in 1920.

Of Fiallo’s prose, his chief claim to fame rests upon his two books of short stories —Cuentos Frágiles and Las Manzanas de Mefisto.

From a young age he also had the political guidance of his father, who took part in important committees to negotiate a Treaty of Peace, Friendship and Commerce between Haiti and the Dominican Republic.

Fiallo was arrested in the last months of 1900 with Arturo Pellerano Alfau, director of Listín Diario during the escalations of repression against the press of the Liberal government of Juan Isidro Jiménes.

He was a member of the National Press Association, directed in 1916 by Arturo J. Pellerano Alfau which also included Américo Lugo, Conrado Sanchez, Juan Durán, Manuel A. Machado, and Félix Evaristo Mejía, among others.

In 1916, Fiallo was apprehended by authorities, under the unfounded allegation of being involved in the revolutionary movement started on April 14 and headed by Desiderio Arias, and imprisoned in the Fortaleza Ozama.

He was sentenced to five years of forced labor and was ordered to pay a five thousand dollar fine for having published an article in the Listin Diario before it could have been approved by the censorship committee.

Your target is outlined in the initial editorial : "We will fight for the final victory in the institutions and practice of liberal ideas will preach freedom at all costs the depredations, the nepotism, cliques, monopolies, have against us .

One cannot find in Fabio Fiallo poems of the hoe and hammer; verses with the crazy rhythm of jazz, strophes that seem to be born in one of those machines that are killing in this world true poetry and noble manual work.