https://www.dw.com/en/jewish-notary-suspected-to-have-betrayed-anne-frank/a-60452956
"A six-year investigation into who betrayed Anne Frank and her family
has yielded a surprising result.
A cold case team that included retired US FBI agent Vincent Pankoke and
about 20 historians, criminologists and data specialists has identified
a little-known Jewish notary, Arnold van den Bergh, as a highly probable
suspect who revealed the family's hideout to the Nazis in August 1944.
A CBS documentary and an accompanying book, The Betrayal of Anne Frank,
based on the investigative team's findings, detail how the Jewish-Dutch
notary van den Bergh allegedly handed over a list of hiding places of
Jews in Amsterdam to the Germans to save his wife, three daughters and
himself."