Why did Malcolm X say "The Irish are the blackest of the Europeans?"?

The Irish were slaves owned by wealthy English planters in the colonies just as the blacks were. "The Proclamation of 1625 ordered that Irish political prisoners be transported overseas and sold as laborers to English planters, who were settling the islands of the West Indies, officially establishing a policy that was to continue for two centuries. In 1629 a large group of Irish men and women were sent to Guiana, and by 1632, Irish were the main slaves sold to Antigua and Montserrat in the West Indies. By 1637 a census showed that 69% of the total population of Montserrat were Irish slaves, which records show was a cause of concern to the English planters. But there were not enough political prisoners to supply the demand, so every petty infraction carried a sentence of transporting, and slaver gangs combed the country sides to kidnap enough people to fill out their quotas."