Carlberg was born in Stockholm and served in the Royal Guards Regiment Göta of the Swedish army while also training to be an engineer.

A strong supporter of Nazism, Carlberg recruited men for both military and civilian service for the Third Reich during World War II.

By this time, he had become a very rich man due to his business interests and used his money to disseminate Nazi propaganda and to fund the Svensk Opposition of Per Engdahl.

Following the war, his Hjälpkommittén för Tysklands barn worked as a relief organisation for German officers, whilst his Svea Rike publishing house, originally set up in the 1930s, was turned over to Neo-Nazism.

[2] After his death in Stockholm, he left his apartment to the Foundation, and in 1965, it was raided by police due to a tip-off that the groups using it had stashed weapons there.