She joined the anti-imperialist organization Joven Cuba in 1934 and met Constantino Barredo Guerra, with whom she had a relationship (including joint revolutionary activities) until 1938.
[1] In 1942, Alonso started writing for the magazine Lux (Light), published by the Sindicate Federation of Electric Stations of Gas and Water, which featured her first interviews with several personalities and political figures, such as Ti Tsun Li (Chinese ambassador in Cuba) and Chilean poet Pablo Neruda.
She also received an award from Alianza Cubana por un Mundo Libre (Cuban Alliance for World Freedom).
One of her most famous books, The Year 1961, which chronicled her experiences during the Bay of Pigs invasion as a war correspondent at Playa Girón, Cuba, won the Casa de las Américas Award.
Tierra Inerme, another of her novels, received the highest recognition at II Spanish American Literary Contest at Casa de las Américas.