London Telegraph 
March 8, 2010
Prince Bernhard, the father of Queen Beatrix of the Netherlands, was a member of the Nazi party, a new book has claimed, contracting the German-born Dutch war hero’s life-long denials.
“Bernhard, a secret history” has revealed that the prince was a member of the German Nazi party until 1934, three years before he married Princess Juliana, the future queen of the Netherlands.
Annejet van der Zijl, a Dutch historian, has found membership documents in Berlin’s Humboldt University that prove Prince Bernhard, who studied there, had joined Deutsche Studentenschaft, a National Socialist student fraternity, as well as the Nazi NSDAP and its paramilitary wing, the Sturmabteilung.
He left all the groups on leaving university in December 1934, when he went to work for the German chemical giant, IG Farben.