In an article in Quote in July 2006, Jort Kelder states that a confidant of Willem Endstra told him that Sijthoff bought two pit houses in Amsterdam from Endstra in March 2001 through the mediation of Willem Holleeder.
In 1983, Holleeder was sentenced to eleven years imprisonment for his involvement in the kidnapping of Heineken president Freddy Heineken, for which 16 million euro ransom was collected.
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The Dutch newspaper De Telegraaf reported on 16 July 2006, that Holleeder and Cor van Hout had planned to kidnap Prince Bernhard instead of Freddy Heineken in the 1980s.
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Born in 1958 in Amsterdam, Holleeder was the son of an employee at the Heineken breweries who lost his job because of alcoholism.
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