Feldmeijer belonged to the
völkisch group in the NSB, just like
Meinoud Rost van Tonningen. This group tried to cultivate the Germanic part of Dutch history, and promoted a racist and anti-semitic view. Feldmeijer had many secret contacts in German SS circles, of which his NSB superiors were not aware. The
Völkisch group in the NSB caused a radicalisation of the party's viewpoints. They idealised the lives of the
Germanic forefathers of the Dutch people, and the proponents of these theories performed much research on these ideas. In 1937, Feldmeijer became an important member of the organisation
Der Vaderen Erfdeel (Heritage of our forefathers), renamed
Volksche Werkgemeenschap (
Volkisch working community) in 1940; This group performed the research for the völkisch group in the NSB. The Dutch people had to learn to realise that their culture was a
Germanic culture; an important step in the direction of the SS way of thinking. Feldmeijer was strongly attracted to the SS ideology, but had to keep his ties with this organisation a secret as the NSB did not fully appreciate this. In the autumn of 1937, he was forced to leave the headquarters of the NSB in Utrecht because of a conflict with the NSB leader Anton Mussert, and was made the district leader of
Salland. In August 1939 Rost van Tonningen appointed him as commander of the Mussert guards. Feldmeijer based the organisation of this paramilitary group of several hundred men on the SS organisation in Germany. In 1939 he made several trips to Berlin to advise the Germans on the Dutch language transmissions of Radio-Bremen. On 3 May 1940 the Dutch government imprisoned him in Fort
Ooltgensplaat, where he shared a cell with Rost van Tonningen. He was later transported to France via Belgium, and on 30 May 1940 he was liberated by German troops in
Calais. On 2 June 1940 Feldmeijer and Rost van Tonningen arrived back in
Den Haag. That same night Rost van Tonningen was invited to a meeting with
Heinrich Himmler and
Artur Seyss-Inquart to discuss the Nazification of the Netherlands and the establishment of a Dutch SS. A few days later, Rost van Tonningen introduced Feldmeijer to
Hanns Albin Rauter, the German head of the Dutch occupied territories police, who was impressed with the vigour and charisma of the young Dutchman. ==Dutch SS==