In honor of the 50 year aniversary of the greatest speech in American history:
Who are the people standing behind Martin L. King, and why are they all wearing white caps ?
You can see the people and their caps in the first 30 seconds of this youtube clip of the speech (from about 0:05 to 0:35).
(the link shows only the final minutes of the ML King speaking… But on the sidebar there are other links to the entire speech… click on one of them! Fifty years later, it’s as moving as it was to those who saw it live.)