A mean dog will sometimes come back to bite the hand that feeds it. So will a stupid monkey.

Almost four year old article, took a while for its ideas to gain traction.

Jewish Encylopedia :

Routes of the Jewish Merchants Called Radanites.

"These merchants speak Persian, Roman [Greek], Arabic, the language of the Franks, Spanish, and Slav. They journey from west to east, from east to west, partly on land, partly by sea. They transport from the West eunuchs, female slaves, boys, silk, castor, marten and other furs, and swords.

The majority of buyers at slave auctions in the Brazil and the Dutch colonies were Jews .

Judaeo-converso slave trader Manuel Gil de la Guardia - Early in his professional career, La Guardia specialised in buying and selling slaves

Aaron Lopez owned 30 slave ships