Does NIOD have material on people who collaborated with the Nazis?
The original files that were created within the framework of the post-war administration of justice (i.e. the trials of persons who were suspected of having sided with the Nazis during the war) can be found in the Central Archives for Special Criminal Jurisdiction (CABR, Centraal Archief Bijzondere Rechtspleging), part of the National Archives in The Hague. The CABR holds files on more than 300,000 people. These people were investigated after the war because they were suspected of having collaborated with the Nazis in some form. Since the CABR contains a lot of privacy-sensitive information, it is not easy to gain access to these files. Prior written permission must be obtained from the National Archives. See the website of the National Archives for more information.
It is not easy to find out whether someone has been a member of the Dutch National Socialist Party (NSB). A complete NSB membership registration is no longer available. The NSB Archives at NIOD consist of a few very incomplete, mostly non-alphabetical lists of names and members, mostly of NSB officers. The card-index system with the names of NSB members that was created at the time no longer exists. After the war, the cards were added to the files that were created for the benefit of the post-war administration of justice as evidence. As mentioned above, these files were collected in the Central Archives for Special Criminal Jurisdiction (CABR, Centraal Archief Bijzondere Rechtspleging), which is held by the National Archives. This makes the CABR the best source for research into possible NSB memberships. However, not all NSB members have their own files in the CABR.
Any Dutch nationals who enlisted in German military service may have their own files in the Central Archives for Special Criminal Jurisdiction (CABR, Centraal Archief Bijzondere Rechtspleging), which is kept by the National Archives. The CABR also contains files on people who went missing or died during the war.
Another possible source of information is the war archive of The Netherlands Red Cross, which contains data on Dutch nationals who were wounded or killed in German military service, or made prisoners of war. Like the CABR, the war archives of The Netherlands Red Cross has been incorporated into the National Archives in The Hague. The website of the National Archives explains how to submit a request for information from the archives of The Netherlands Red Cross.
Finally, there are two departments of the German National Archives you could contact:
The Personenbezogene Auskünfte zum Ersten und Zweiten Weltkrieg in Berlin-Reinickendorf Department (the former Deutsche Dienststelle WASt) and the National Archives, Military Archives Section.
These two departments hold such personal files as have been preserved of former military personnel who served in the German armed forces (including foreigners in German military service). Since much of the material has been lost, however, the files of many former soldiers are missing. For more information see the website of the German Bundesarchive.
Information about Dutch nationals who fell in German military service or went missing may also be obtained from the Volksbund Deutsche Kriegsgräberfürsorge e.V., the German War Graves Foundation.
The NSKK ('Nationalsozialistisches Kraftfahrkorps') functioned as the paramilitary transport organisation of the German armed forces. Due to the high salaries, among other things, this corps soon employed several thousand Dutch drivers. Dutch NSKK members worked in Belgium, France and behind the Eastern Front lines. More information about the NSKK can be found in volume 6 of Het Koninkrijk der Nederlanden in de Tweede Wereldoorlog (‘The Kingdom of the Netherlands During the Second World War’) by L. de Jong (pp. 437-441) and in the book Ook gij behoort bij ons! Het NSKK in de Lage Landen (‘You, too, are one of us! The NSKK in the Low Countries’) by Alex Dekker (third revised and supplemented edition, Just Publishers 2013). An article by Alex Dekker on this subject was published under the title 'Ook gij behoort bij ons! Nederlanders bij het NSKK' (‘You, too, are one of us! Dutch nationals in the NSKK’) in the Achtste Bulletin van de Tweede Wereldoorlog (‘Eighth Bulletin of the Second World War’) by Perry Pierik et al. (eds.), Uitgeverij Aspekt 2005, pp. 9-37.
For information on individual Dutch NSKK members, the Central Archives for Special Criminal Jurisdiction (CABR, Centraal Archief Bijzondere Rechtspleging) again is the obvious resource.