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
Katyn Forest massacre
Katyn massacre
Marcel Petiot