Several of those who participated in those actions were killed in the Palace itself and in the case of José Antonio in a side street of the University of Havana where he was heading after leaving Radio Reloj to continue leading the revolutionary struggle from there.

Other participants in the assault on the Palace were captured and killed in places close to the building that served as the dictator's headquarters and there were others who initially managed to evade the repression unleashed by the dictatorial regime.

Thus the fighters José Machado Rodríguez, Juan Pedro Carbó Servía,

Fructuoso Rodríguez Pérez and Joe Westbrook Rosales were able to remain hidden for several weeks in an apartment on the second floor of the building located at 7 Humboldt Street, very close to Malecón Avenue in Havana.

As a consequence of the denunciation made by a traitor, on April 20, 1957, a group of policemen of the dictatorial regime arrived at that building with the objective not only to capture but also to assassinate the young revolutionaries.

When the members of the Revolutionary Directorate who were in apartment 201 became aware of the situation, they tried to leave it quickly in various ways.

One of them, Joe Westbrook, was able to jump downstairs and asked the person living in the apartment to pass him off as a visitor.

Even the policemen knocked on the door of that apartment and he opened it but when he was recognized he was captured and when he barely walked a few steps they shot him with a machine gun.

Juan Pedro Carbó Servía headed towards the elevator, but was intercepted shortly before arriving and was also machine-gunned.

José Machado Rodríguez and Fructuoso Rodríguez Pérez jumped through a window to the first floor of the building. They fell into a long and narrow passageway that belonged to a car dealership.

Since they fell from a certain height, Fructuoso remained lying unconscious on the floor and Machadito fractured both ankles, which prevented him from getting up.  In addition, even if they had been in good condition, the corridor was closed with a grille with a padlock on it.

The henchmen shot them through the bars of the grille with a machine gun.

The ages of the four murdered youths ranged between 20 and 24 years.

In the presence of the neighbors of the building, witnesses of the horrendous crime, the bodies of the four young men were dragged to the sidewalk in front of the building where they remained for several minutes until they were thrown, later, onto a truck.

The henchmen of the Batista dictatorship did not even flinch at the protests and sobs of the people and even intimidated them with bursts of machine guns fired into the air. 

After the triumph of the Cuban Revolution in 1959, every year on April 20, an emotional tribute has been paid to these four young revolutionaries assassinated in Humboldt 7 in 1957 by forces of the Batista dictatorship.

Their names are inscribed in the history of the revolutionary struggle in Cuba and also identify today several student centers.