He was the producer of the program La República de los Niños (The Children's Republic) in Radio Illimani, and wrote columns in various newspapers.

Militant of the Communist Party of Bolivia, was the partner of Nilo Soruco, a singer-songwriter who acclaim many of their poems.

The social concerns of the author and his effort to capture the customs and lifestyles of Bolivia characterize his work.

Some of his poems were translated into different languages— particularly into German, Esperanto, French, English, Portuguese and Russian; El cuento de las estrellas (The story of the stars) was published in Russia in 1984.

After the death of Alfaro, his widow, the teacher Fanny Mendizábal, was responsible for continuing the diffusion of his work.