Two sanitation workers, Echol Cole and Robert Walker, were crushed to death by a malfunctioning truck in February 1968. The strike that followed was about pay, recognition of the union, and not being killed at work. The placards read I AM A MAN.
King came to support it. By 1968 he had moved well beyond segregation law toward poverty and the war in Vietnam, positions that cost him a good deal of the support he had held in 1963.
On the evening of 3 April, at Mason Temple, he gave the speech that ends with him saying he had been to the mountaintop and had seen the promised land, and that he might not get there with them. He was killed the next evening on the balcony outside room 306 of the Lorraine Motel.