At the outbreak of
World War II in 1939, Erickson continued his oil business with Nazi Germany, making millions of dollars in the process. After being placed on a wartime
blacklist by the US in 1942 for collaboration with the enemy, Erickson was disowned by his brother in America. In order to clear his name, Erickson agreed to work for the Allies, and was given the code name 'Red' by U.S. intelligence. Pretending that he was a
Nazi sympathizer interested in building a refinery in Sweden to process oil for Germany, he spied after 1942
German synthetic oil plants for the OSS, which used his information to provide targeting data for Allied bombing raids. Erickson visited Germany more than 30 times between 1939 and 1945. During his visits he fell in love with a German woman, Anne-Maria Freudenreich, who was shot by the
Gestapo at
Moabit Prison in 1945. Alexander Klein wrote a 1958 book about Erickson's World War II exploits,
The Counterfeit Traitor, which was made into a 1962
movie of the same name, starring
William Holden in the role of 'Red' Erickson. While mostly accurate, the film included some invented material including Erickson's daring escape from Germany in 1945. Erickson himself appeared on "To Tell the Truth" June 3, 1958, to publicize the book, which also included some invented material such as his killing of a Gestapo agent. ==Death==