Polish scholar Adam G. de Guroswki, who travelled extensively in
the United States, wrote in his 1860 book Slavery in History:
The Jews were the common mediators and factors in this traffic (child slave trading), as well as the most extensive slave-traders all over Europe, both then (4 & 5th centuries A.D.) and in subsequent times; and a considerable part of the hereditary hatred of the European masses towards the Jews is to be ascribed to this historic fact.