Martin Luther King, Jr. a soulful advocate of Peace, Freedom, and Justice. He quite literally gave his life for the people of the United States and the world. His battle for justice put him in grave danger especially after he challenged the US invasion and destruction of Viet Nam. Below is the speech where he outlined his reasons for opposing that terrible war.

https://www.goodreads.com/author/list/23924.Martin_Luther_King_Jr_

"Call it democracy, or call it democratic socialism, but there must be a better distribution of wealth within this country for all God's children."
- Martin Luther King, Jr., Speech to the Negro American Labor Council, 1961.