With a career that united him with other figures who advocated the armed struggle to achieve the independence of Puerto Rico, Cintrón Fiallo is exalted by his comrades as commander, along with murdered Filiberto Ojeda Ríos, founder of the People´s Army Boricua-Macheteros.

Born in the capital of the Dominican Republic, where his mother, intellectual Thelma Fiallo Henriquez was from, the fighter stood out as a union leader.

At the same time, he remained active in political organizations, such as the Pro-Independence Movement (MPI) and the clandestine Armed Liberation Commands (CAL), which Juan Mari Brás was said to have led under the pseudonym Alfonso Beal.

In the 1970s, faced with the intensification of repression in Puerto Rico against the left, he was among the organizers of the Unitary Committee Against Repression (Cucre).

Cintrón Fiallo also served prison for refusing to testify before a federal grand jury, with which the United States authorities intended to break his will and that of other fighters to provide details of an armed attack against a bus occupied by members of the USA Navy.

In April 2006, agents from the Federal Bureau of Investigation (FBI) broke into the apartment of his life partner, Liliana Laboy, a professor at the University of Puerto Rico, in Río Piedras, but none of this managed to reduce his impetus to fight for the independence of Puerto Rico.

Since the death of Ojeda Ríos in 2005, every year Cintrón Fiallo led an event in his honor on September 23 at the Naguabo cemetery, where his remains rest.

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