Chambers of commerce from Europe, North America, Australia and India are complaining bitterly about trips aborted and business lost.
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The unwieldy government deficits in the U.S. and Europe loom as Chambers' biggest worry.
At a tax conference organised in Warsaw in March by the American Chambers of Commerce in central Europe, there was no shortage of complaints from the Polish-based companies.
Chambers also blamed the governments of Europe and North America for not buying gear as they once had.
Chambers has been invited back for a further session with NFL Europe in January.
He'll then go to Birkenau, the other part of the Auschwitz compound, where Jews transported from all over Europe were sent from their trains to the gas chambers.
The lobby group's letter comes a week after a major survey by the British Chambers of Commerce suggested most UK companies wanted to stay in Europe, but with some powers brought back home.
On one bus trip in Europe they visited a camp, looking at the gas chambers.
Even most of Europe's troubled economy appears to be recovering, Chambers said, though he expects the southern part of the continent to remain in terrible shape for an extended period.
Business lobby group British Chambers of Commerce (BCC) says most UK companies want to stay in Europe, with some powers brought back home.
"The vast majority of businesses across the UK want to stay in the single market, but on the basis of a revised relationship with Europe that promotes trade and competitiveness, " said John Longworth of the British Chambers of Commerce.
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From Europe to the Pacific, we've been the nation that has shut down torture chambers and replaced tyranny with the rule of law.
This was where the Nazis installed four gas chambers and crematoria to speed up the murder and disposal of people, who were mostly Jews, from across Europe.
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