Karl Buchholz und German Person-Info 

( Ich bin Karl Buchholz)
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New York museums have not returned Nazi-seized art

Valentin sent the money back to Karl Buchholz, a Nazi agent and German gallery owner who passed on the revenue — minus his 25 percent commission — to the Nazi government, Petropoulos said. “Valentin proceeded to sell hundreds of works purged from German state museums in America,” said ...