Before the war, Barend Klooss worked as an office clerk in his hometown of Rotterdam. In 1936, he left for Saigon to work for Diethelm & Co. in the shipping and insurance industry, and later at the Dutch consulate. In January 1941, he enlisted in the Dutch army in Canada, after which he moved to England. He was then recruited by Special Operations Executive in May 1942.
As a member of Operation Leek, Klooss was parachuted in along with Henk Sebes on April 5, 1942, with the task of carrying out sabotage in Overijssel, including hindering enemy warfare in the event of an invasion. Just three weeks later, on April 29, 1942, he was arrested. Sebes was arrested on May 9. After imprisonment in the Haaren and Assen camps, Klooss was transferred to the Mauthausen concentration and extermination camp, where he was executed on September 6, 1944.
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