Martin Luther King Jr being attacked as he marched nonviolently for the Chicago Freedom Movement, 1966, which was the most ambitious civil rights campaign in the North of the United States, and lasted from mid-1965 to early 1967.
African slaves were very expensive (50 Sterling). Irish slaves were cheap (no more than 5 Sterling) and most often were either kidnapped from Ireland, or forcibly removed. They could be worked to death, whipped or branded without it being a crime. Many times they were beat to death and while the death of an Irish slave was a monetary setback, it was far cheaper than the death of an expensive African. African slaves were treated much better in Colonial America.