According to the documents in the file concerning his successful application to become a Dutchman after the war the couple provided undercover protection for Jews trying to escape the authorities .
According to the documents in the file concerning his successful application to become a Dutchman after the war ministerie van justitie ( 1915 - 1955 ) inv . 
 No. 13533 ( 1646 ) the couple provided undercover protection for Jews trying to escape the authorities .