 Gjems-Onstad was arrested by Swedish police in Stockholm on 25 March 1941, as parts of Munthe's organisation had been exposed.Gjems-Onstad was imprisoned at the Stockholm police station for 13 days, and then for 59 days in the Stockholm Remand Prison.On 23 May 1941 the government decided that he was to be expelled and banned from entering Sweden (the ban was repealed after the war).