There is no evidence to support any of these statements. However, in 1980, he was cited by former U.S. spymaster Col. John F. Grombach as a World War II source. Grombach had been founder and head of a small independent espionage agency, later known as "The Pond", which operated from 1942 to 1955. Grombach asserted that Petiot had reported the Katyn Forest massacre, German missile development at Peenemünde, and the names of Abwehr agents sent to the U.S. While these claims were not supported by any records of other intelligence services, in 2001, some "Pond" records were discovered, including a cable that mentioned Petiot.