There are records of Irish sold as slaves in 1664 to the French on St. Bartholomew, and English ships which made a stop in Ireland enroute to the Americas, typically had a cargo of Irish to sell on into the 18th century.
Few people today realize that from 1600 to 1699, far more Irish were sold as slaves than Africans.
By English traders? I can believe that. I don't about "far more" but it's certainly a mixed group in the 1600s.
Whoever criticizes capitalism, while approving immigration, whose working class is its first victim, had better shut up. Whoever criticizes immigration, while remaining silent about capitalism, should do the same.