From 1933 he was a member of the party Nasjonal Samling (so were his brother Thorvald Thronsen, four other siblings, and both parents), and during the occupation of Norway by Nazi Germany a career path opened for him.
In October 1940 he was appointed as national chief of finance in Nasjonal Samling.
The reason was that a corruption case was filed against him, even though he was not found guilty of it.
[2] During the legal purge in Norway after World War II he was convicted of treason, and sentenced to eight years of forced labour.
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