Claus Helberg (31 January 1919 – 6 March 2003) was a Norwegian resistance fighter and mountain guide.
[1] He was a member of Company Linge, a resistance commando unit that was best known for carrying out Norwegian heavy water sabotage during World War II.
According to The New York Times, "[he was] the favorite mountain guide of Scandinavian royalty..."[1] These clients included Queen Sonja and Margrethe II of Denmark.
In 1938, he started working for a touring organization that wanted to make the mountains less forbidding for visitors.
She refused, and Terboven ordered that everyone in the hotel be arrested and sent off to Grini concentration camp for questioning and possible internment.