Cuula was the head of propaganda during the 1930s and had membership number 240 in the Swedish National Socialist Workers' Party led by Sven Olov Lindholm.
He also participated in the establishment of Frontmannaföreningen Sveaborg, an association of Swedes in the Waffen SS.
He stepped on a landmine on April 14, 1942, and was buried at Stockholm's Norra begravningsplatsen on May 9.
[7][8] In Satakunta, in Cuula's home region of Finland, a memorial for him has been erected in the war hero section of the graveyard.
Hallberg-Cuula is idolized by Swedish neo-Nazis,[3][4] who annually visit his grave to lay flowers there.