Why is Alberto Hurtado so important in Chile?

Because, he was popularly recognized for be the founder of the "El Hogar de Cristo" on 1944.
He was appointed diocesan director of the Catholic Action youth movement and the very next year, its national director (1941–1944). That same year, in 1941, Hurtado's sociology -oriented mind led to his authoring of the book Is Chile a Catholic country? Revealing a few shocking realities as it was, the book raised a storm among conservative Catholics in Chile, who even accused him of being a Communist.
In 1947, Hurtado entered the labor movement, shepherding Chilean workers. Inspired by the social teaching of the Church he founded the Chilean Trade Union Association, meant to train leaders and instill Christian values in the labor unions of his country. For them he wrote the three books Social Humanism (1947), The Christian Social Order (1947) and Trade Unions (1950).
I think he is a person who give all for help the people.